Catawampus- Yes, I have, but not often
Dagnabit- No, but a friend does.
Skullduggery-Yes
Rapscallion- Yes
Tarnation- Never
Flibbertigibbet-Yes. but rarely
Hugger-mugger-No
Absquatulate-No
Blotto- on occasion
Hoosegow- Maybe
Rumpus- no
Skinflint- no
Higgledy-piggledy-yes, but rarely
Piffle-no
Flapdoodle-no, it sounds vaguely scatilogical to me.
Lepidopterist- yes.
I do use flummox routinely, however.
I’ve used the following words (some sarcastically, some seriously), and I might have used others without being able to remember it (I like having a reasonably extensive vocabulary):
Skullduggery
Rapscallion
Tarnation
Flibbertigibbet
Blotto
Rumpus
Skinflint
Higgledy-piggledy
Piffle
Lepidopterist
Why this particular list? Do they have some unique fascination for you?
Catawampus - all the time
Dagnabit - yes
Skullduggery - yes
Rapscallion - yes
Tarnation - yes
Flibbertigibbet - no
Hugger-mugger - no, what is it?
Absquatulate - no, what is it?
Blotto - yes
Hoosegow - no
Rumpus - yes
Skinflint - yes
Higgledy-piggledy - yes
Piffle - yes
Flapdoodle - no
Lepidopterist - yes
Well, let’s just say… back in my crazy youth, I used to do some googlewhacking .
Ah… those were the days…
The list is a little bit random. It mostly comprises somewhat antiquated slang terms that I thought people would recognize, but never use. I’m staggered by how many of these words are in actual use, going by the testimony of those who have posted here. I don’t think I use a single one myself.
I’ve used these. I rather like the sound of rapscallion, actually.
I’ve probably used all of those words in the past, with the exception of “absquatulate,” which I am now using.
Some people, instead of saying “how are you” or “what’s up”, will say “What’s the good word?” To those people, I often say “absquatulate”.
That’s the way I say it too. And my mother, and my father …
I say it here in the North (I’m from the South) and people look at me strange 
Never used any of the other terms, though …
PS: What about “jeezum crow”? or “hinky”?
Catawampus yes
Dagnabit yes
Skullduggery yes
Rapscallion yes
Tarnation yes
Flibbertigibbet yes
Hugger-mugger once or twice I think
Absquatulate no
Blotto yes
Hoosegow certainly!
Rumpus yes
Skinflint yes
Higgledy-piggledy yes
Piffle rarely
Flapdoodle yes
Lepidopterist yes
No, and yes.
Catawampus - yes, although like YaWanna, I say “cattywampus”
Dagnabit - yes
Skullduggery - yes
Rapscallion - I have, but not very often
Tarnation - yes
Flibbertigibbet - no
Hugger-mugger - no
Absquatulate - no
Blotto - yes
Hoosegow - yes (also “pokey”)
Rumpus - yes
Skinflint - yes
Higgledy-piggledy - no
Piffle - no
Flapdoodle - no
Lepidopterist - no
Dagnabit — yeah
Skullduggery — sometimes
Tarnation — yep
Hoosegow — probably from juzgado. Yeah sometimes.
Piffle — but of course
None of the others though.
And you forgot widdershins. I think widdershins oughta be on that list.
Catawampus -no
Dagnabit -no
Skullduggery -yes
Rapscallion -no
Tarnation -no
Flibbertigibbet -no
Hugger-mugger -no
Absquatulate -no
Blotto -no
Hoosegow -no
Rumpus -yes
Skinflint -yes
Higgledy-piggledy -no
Piffle -no
Flapdoodle -no
Lepidopterist -yes
I’ve never even heard of these words:
Catawampus
Hugger-mugger
Absquatulate
So now I have to open the dictionary.
New question: who can use all of them in a sentence?
I meant all of them in one sentence?
Err…not me! I’ve never used a single one of them, spoken or written.
Where is flibbertigibbet from? That sounds so familiar… I can hear a woman saying it in my head…
Cattywampus: yes. Quite a bit.
Absquatulate: only in the sense of “you know what’s a cool word? ‘Absquatulate’.” Doesn’t come up in casual conversation, unfortunately; how often does somebody run off with the money & squat somewhere?
The Sound of Music…“how do you solve a problem like Maria…a flibbertigibbet, a will-o-the-wisp, a clown.”
Skullduggery
Rapscallion
Both of these, but in a slightly-ironic manner.
Blotto
Rumpus
Skinflint
Higgledy-piggledy
Yup
Piffle
This is a useful one in front of children, when you’re tempted to swear, as in “what a load of piffle”
None of the others, and I’ve not heard many of them before at all.