Top definition
A game invented by the romans long ago. Taking the insides of the pumpkin out ,and then drilling two holes opposite from eachother ,and inserting oneself and the competitors penis to have an ultimate sword fight. Usually played around halloween.
Yo bro, lets play the collisium i'm bored.

Nah my penis is still sore from the last time you clobbered me.
via giphy
by ElongD November 20, 2016
Get the mug
Get a The collisium mug for your father Manley.