Getting with

To get with someone
British slang used to describe two people kissing etc.

Woahh Beth totally got with that hot boy last night!

I am kinda thinking of getting with Sarah on Wednesday :/

get it on

get something started

I got my popcorn, I got my candy, I got my baby; let's get this movie on

get with

To engage in sexual acts with

Craig said that after we left he got with that Rutgers chick, but knowing him he was probably too drunk to get it up so they just cuddled

get

a hook up, someone that your happy about, not a person you would deny having relations with.

A hookup that is a person cooler/hotter/better than you

"bro, gina was such a good get"
"no man, you were a get for her"

Get at that

A term used to show acknowledgement of something somebody was going to do or something somebody wants to do.

Stevie(drinking an Arizona Ice tea):damn this is dank...
Mathias(thirsty):aye...Lemme get at that decently fat.

Mathias:Gonna go take a piss...
Stevie:Get at that...

getting on

getting to know a person, opposite sex,
wanting to go out with in the near future

I fancy getting on her, cos we talk alot!

Getting on it

To venture out with the intention of achieving absolute drunkedness.

guy 1 'Hey man what time does the party start?'

guy 2 'pfft who cares? I'm getting on it now!'