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1.
A whatchamacallit. You know, a thingamajig. It's like a doohickey but not quite.
"Pass me the dooverlackie. The thing, that you use to open the other thing! Yes, that one!"
by Flashman May 13, 2007
 
2.
when you can't remember a word or don't know it
oh my god he's such a ... dooverlackie!
by Vivianne November 13, 2003