Slang term used to either:

1. Announce the sale of an object costing one dollar and fifty cents.

or

2. Be a synonym for male genitalia.
Ex 1.
Clerk: That'll be a dolla fitty.
You: How much?
Clerk: A dolla fitty.
You: All right.

Ex 2.
Friend: Hey, see that girl over there? Bet you won't ask her out.
You: Ha, I'll do more than that. I'll give her a dolla fitty tonight.
Friend: Oh man, tell me about it tomorrow!
You: Cool
by Darth_Kirby November 13, 2009
Get the dolla fitty mug.
A blow job, blowie, sucky sucky etc

Me give you fitty dolla long time
Did she give you a fitty dolla last night?
by BB July 29, 2003
Get the Fitty Dolla mug.