Based on the age range and context this term is put in, it can mean a number of different things

1) Middle school age- kissing or making out at most (unless for those few mature sluts who make make it farther)

2) High School- Generally having sex. For most freshman and some sophomores, this means kissing or making out, unless they make it farther which can be common

3) Young adults- sex.

4) Older adults, like parents- Being really nicely helped out
1)John and Lilly are hooking up at the school dance tonight!
2) I hooked up with the quarterback, his d is tiny
3) I think I might've hooked up with Jerry when I was drunk.....
4) Wow!! Bobby really is hooking me up with those concert tickets!
by thottyhoe March 13, 2015
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An incredibly ambiguous phrase that drives me absolutely insane when people use it.
John hooked up with Mary. (so what did they actually do? Did they meet at the park? Did they talk? or did they duke like viagra-injected rabbits? who knows...)
by thedon November 17, 2004
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When 2 people kiss and/or fuck.
I agree, it depends on your region.
'I hooked up with your sister'
by Diego November 13, 2003
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a way to get something you want. either thru someone or something.
yo, i dont need to do hw cuz i got the hook up
by da madd scientist October 3, 2003
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Guy A:"Did you hook up with the guys last night?"
Guy B:"Yeah. Guy C hooked us up."
Guy A: "Was Girl 1 there? Y'all should hook up."
Guy B: "She hooked up with me after. We, like, hooked up."
Guy A: "So...did you hook up?"
Guy B: "No."

An actual conversation, heard on the Chicago CTA.
by Scrivv July 28, 2009
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1. recieved a good or service as a favor
2. to make out with someone
3. to have sex with someone
1. Jerry gave me the hook up with those backstage passes.
2. Sandra and I hooked up last night and her adams apple was kinda big
3. Hooking up with Derick last night was the biggest mistake in my life.
by Doctor Crayon December 31, 2004
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1. In middle school: holding hands and hugging
2. In high school: making out, fondling, handjobs and blowjobs
3. In college: drunken one night stands
4. Beyond college: wild sex
1. Sean and Jennifer hooked up after school yesterday.
Middle school girls: "oooooh!"

2. Sean and Jennifer hooked up after prom.
High school friends: "tell me more about this!"

3. Sean and Jennifer hooked up during the wild frat party.
College broskis: "yeaah, good for you, man!"

4. Sean and Jennifer hooked up after they got wasted at the bar.
Anyone: "casual sex? whatever, happens all the time."

And that's how people hook up.
by Grandma Maxie July 19, 2011
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