That fun, totally gorgeous, blonde girl who likes music and theatre, but is totally easy and has huge tits. She hangs out with some cool people, alot of gay men, and musicians. She likes to sing every word she says.. which is weird.
MAN1: Hey, did you see Liisa yesterday?
MAN2: Yeah! She's totally hot.
MAN1: Hey, doesn't Liisa have a nice rack?
MAN2: Hell Yes! I saw her with those musicians yesterday.
http://www.urbandictionary.com/define.php?term=Liisa