Top Definition
(tom-sin-ism): n. Someone who thinks at the utmost derpy levels of the human brain, whilst simultaneously speaking the human translated dialect of bird. Additional attributes may include, but are not limited to, subtle moaning sounds, strong attachment to drama, pokemon, extreme obsession with Dave Matthews Band, internet surfing, and can often be found perching on furniture like a vulture or in the fetal position. Habits include overthinking, ceramics, and piano playing. Physical appearance may allude to but falsely advertise being severely 'baked' (see 'stoned').
A Thompsonism smolder resembles 'Crush' from Finding Nemo

A Thompsonism perching resembles 'L' from Death Note
by aeilyta October 21, 2011

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