look up any word, like fleek:
 
1.
A Super Smash Brothers or Super Smash Brothers Melee tournament.
Yo there's gonna be a smashfest at John's tonight.
by valoem February 07, 2005
 
2.
a gathering where a group of people play Super Smash Bros., for fun and to train their skills.
Man, I kept getting my ass kicked at last week's smashfest.
by wisl March 22, 2009
 
3.
When a huge group of people get together for one soul purpose. To have lots of sex! Basically an orgy.
Bob: Yeah dude. we went over to Cast's last night to have a Smashfest!
Sarah: I wish I would have known! I need a good fucking.
by Raaalphie. June 25, 2009