What it means
In British slang, to pull means to successfully get with someone on a night out, whether that's a kiss, a snog, or the start of something flirtier. It's the classic did you pull last night kind of word, all about leaving the pub or club with your chat-up mission actually landing.
Usage examples
"He pulled at the party and we did not see him again."
"Dressed like that, you are definitely going to pull tonight."
"He was grafting for hours and somehow still managed to pull before closing time."
"You lot can laugh at my shirt, but watch me pull in it anyway."
Where it comes from
This comes from the ordinary verb pull, meaning to draw something toward you. In British slang it narrowed into the romantic sense by the late 20th century, where pulling meant attracting someone successfully on a night out and getting somewhere with them, usually in a casual flirting or kissing context.