Top Definition
An act by a male that is totally uncalled for. Only males have a Y chromosome and some things they do can be classified as 'typical'
4 guys and a girl walk along the street. she says (looking at her hot dog) 'wow, this is bigger than I thought!'
All guys start laughing and say 'that's what she said'
the girl says 'urgh - you are so y-chromosome-ish!'
by toffeetheturtle17 April 26, 2010

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