A group of imbeciles that talk to each other and themselves about stuff they think is cool, but really isn't.
I can't believe I hung out with the mentally ill billy's and listened to them talk about the stripper that "really liked" them at the club.
Botis: dude she was looking at me
Miley: no man, she sat on MY lap
Botis: dude she was looking at me
Miley: no man, she sat on MY lap
by Bittermama66 September 17, 2017
Get the Mentally ill billymug. An abbreviation of sorts used strategically by war thunder players to explain they are coming back to the game soon
by Seenor Jane April 19, 2021
Get the ill b oib siinmug. by dtrean June 30, 2008
Get the ill start it you finish itmug. by mikeesins April 4, 2020
Get the ill see you tomorrowmug. by LiamiFromMiami February 5, 2014
Get the ill flip youmug. by Jon and lindsay July 23, 2004
Get the ill na na namug. 