Top Definition
n. a person who has not yet had their first kiss although they have been given many opportunities. This person will not get laid until he is around 45 years old. This is because his extremely tiny penis and that he is unsure of his sexuality.

v. To avoid girls because of your small penis.
Dude Greg hasn't gotten laid yet, he's behaving like such a Tummus.

Look at the way Miller Tummuses because his small penis.
by Heyitsmeyourfavorite January 22, 2014

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