Oh, you do not.
I call them “Whatsits” or “Who-ja-ma-call-its” or “Thingummies”.
It’s that thing over there, or that thingamabob.
whopper-dealies
What-ya-ma-call it…
Thingie…
Thingie-ma-bob…
Da kine…
What’s-it…
You know! The thingie by the what’s-it next to da kine and the what-ya-ma-call-it! 
<< No one is listening until you fart. >>
Dinguses.
“The guy with the thing we saw that time. You know, that guy.”
Yes, the whole sentance to describe a single lost item. There is a family story here, of course.
Cheers,
G
I’d like to call em ‘penises’ or maybe vaginas
Hey you see the neighbors erecting that er purple penis thing for the backyard? It came with one of them there er vagina! the kids are gonna love that!
Dang it I lost the corkscrew penis I needed for assembly, it’s supposed to lock into this vagina here:o
just brave enough to call them thingamajiggers though.
Porqueria
Hoojamaflips.
OK pay attention, I am only going to go through this once.
The What-ja-ma-callet attaches to the dingus, and is secured by the whos-ist. See that whats-it that sticks off the end of the dingus? That bolts to the thingie over here. Once you have it bolted down, it holds this dealie in place. This doohicky ::: points::: then plugs in here. Then go back and tighten the bolt to the German torque spec.*
*Goot and tight
pinganillo: officially, the name for the ear thingees that people on TV wear so they can get instructions. Unofficially, any thingee
pinganillo mágico: USB flash drive
Or, in English, “thingee” and “magic thingee”.
Thangs
“thingy”
Except to the family it’s “thingy-with-the-stick-and-the-fur-with-eyelashes-that-people-do”
I can’t remember exactly where that comes from. I know it’s a long forgotten childhood joke but I can’t remember the details.
It’s a donacker.
Or a thing-a-ma-jigy.
Or just thingy.
I call it a “u-no.” As is “I need a thingamajig.” “A what?” “I thingamajig. A—You Know.”
Third’n’ the Thingie. Or do you say “thingy?”
Dootamajobbies.
Doomagidjee, or hoopajoo.
I was in Germany, and I know for an absolute fact it’s spelled “gutenteit.”
Around hour house we have framastats, both left-handed and right-handed. Anything shiny is bling – nuts, bolts, washers. “Hamme 'at bling 'ere, will’ya?”