An old women with manly features at a bar/club. A Chella is the out of place loud drunk old lady you see at bars and clubs that has no business being there because they're creeping out the young people. Usually the old drunk crying out "Whooo hooo! Look at me everyone! I'm drunk wild and in a club/bar with young people and I still got it!"... they really don't have it.
Ron Jeremy: Ooh la la! Check out that easy sleezy senior!
Will Ferrel: Yikes! She's a freaky Chella! I tell you, you are one twisted little man.