Top Definition
When a person can't think of the names of objects/people and uses 'thing' instead of the proper name, usually done in excess
"Can you go take your...uhh...'thing' for a walk now?"

"You mean my dog?"

"Yeah, sorry, it's my athingamatism acting up again."
by Pie_Faced_Joey July 20, 2009
6 Words related to Athingamatism

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