OK Trade, I’ll let that one slip. 
Is riff raff two words or is it hyphenated? I know riff can stand alone but how about raff?
Teach,
The Dictionary agrees with you that ‘You can mete out awards or mete out honors’ but I think mete is now associated with bad things.
OK, what can I do with a PETARD, other than hoist it?
You don’t hoist it, it hoists you. You’d be more likely to bury it.
I’ve always used the word scrimp as a slang term for sex. Such as, Woah, you scrimped a girl???
Gall seems to be the only thing around that can be unmitigated. The word fro I’ve never encountered except in the phrase to and fro. ** Deucedly** modifies clever only, I guess. Pitch, as an adjective, finds black as its only mate. And the poor yeti! He’s the only creature that seems to have garnered the title abominable! (I’d like to meet someone with an “Abominable cat”!) Also, in the political field, Manuel Noriega was the only strongman around, according to the media.
“He has an abominable odour about his person” (or did you mean that the only abominable animal is the Snowman of that nature?)
“The party was an unmitigated disaster”
Of course ‘pitch black’ is the only use of pitch in that context - it’s like ‘sky blue’ or ‘blood red’.
It means ‘Black like pitch’, pitch being ‘A thick, black, lustrous, and sticky substance obtained by boiling down tar.’
Can you whet anything besides an appetite?
What, because Irregardless isn’t really a word? I mean, sure, it’s in the dictionary, but only because people used it so much they had to add it. Was this what you were looking for? 
Happy to oblige.
Jman
(I feel like such a killjoy, but I can’t let these things stand…)
Does frick ever travel without frak?
What else can you do to havoc without wreaking it?
Also, I always hear the phrase “Not too shabby,” but I have never heard, for example, “Damn, that’s the shabbiest thing I’ve ever seen.” Maybe it’s just me.
And I believe fro is “fro’” as in a shortening of the word “from”; so you could say “I came fro’ England.” Yeah, it’s a long shot, but that’s the best explanation I can come up with.
Cry it.
To quote the bard:
‘Cry havoc, and let slip the dogs of war!’
(Julius Caesar, Act III, scene 1.)
Or play it:
**flotsam and jetsam[/] - trash floating in the water and stuff tossed overboard. Seems redundant.
Also, very often thgether: cease and desist
I’ve finally got it!!!
aleck
are there any alecks out there who ain’t smart?
Whooohoo!! what do I win? (wait a sec, it’s my th…)
Did I forget to mention that the winner gets a date with a doper of his/her choice? oh, and that this was a contest?
{Of course, stuyguy actually won it a long time ago. But I came up with 2 - can smarty describe anything else but pants?)
Boston (and national) sportswriters can’t say “Tim Wakefield” without adding “knuckleballer” before it.
I think this one almost counts. Abject. Unless followed by terror or poverty, are there any other valid uses?
And as for sillier entries…
Can “yore” be used without being preceeded by " In Days of"?
Can “tisket” or “tasket” be used seperately? (are they even real words?)
Can “yon” be used without being preceeded by “hither and” ?
Can “Aback” be used without “Taken”?
A derogatory term for someone of Hispanic lineage, but misspelled.
Employees are always disgruntled . . .
but spouses are always estranged.
And for the person who mentioned “zany” and “madcap”, you forgot wicky-wacky!!