Sleeo is a group of blasphemous musical youngsters who spit in the face of God and all that is decent.
'Hey, you guys heading to the Sleeo show?'
'No man, those guys are just too evil for me'
An insulting term. It could be used for replacing jerk, idiot, asshole, slut, whore, or even sleeping around. It's a very broad word, not used for anything specifically, and can confuse others.
Last night I was sleeoing off for a good hour and a half!
You're such a sleeo, man.
Dude, where you just sleeoing?!
That girl is such a sleeo.
He/she sleeos with everyone!