Top Definition
"To stand around doing nothing, ergo to have one's thumb up one's ass."

I came up with this word while working as a daily Assistant Director on the set of "Death To Smoochy" whereby I spent 18 hours one particular day doing absolutely nothing.
'Workwas soboring,I was totally thumassticated.'
'Bill is so lazy,a complete thumassticator.'
'This jobis thumassticating.'
'I have no plans but to thumassticate.'
by ricardotoronto April 06, 2009
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