"Let me
stop" is one of the few actual phrases on Urban
Dictionary that is slang. Though the exact origin of the phrase is unknown, like with many, it is often used here in New York.
It is usually used by one who is doing OR saying something that can be considered:
Overdoing it
Ridiculous
or perhaps going to far (as a previous
definition suggested).
Tyrone: "That
girl you talk to looks good, I should holla at her."
Shaniqua: "What? Did you see that
girl'
s weave?"
Tyrone: "That's her real hair, ain't it?"
Shaniqua: "Please, that bitch is
bald. And her hair, that shit is fake. Nah, let me stop."
Shaniqua realizes that she's saying too much, whether funny or not, and because of this... she uses the phrase "Let me stop" at the end of her statement. Shaniqua needs to stop getting out of line.