8
Hooking up refers to having sex, messing around refers to anything else (mostly beneath the waist) and making out is just making out. Done. Hooking up is having sex with no expectations or strings attached.
I was hooking up with this guy last night... means i was fucking this guy last night.

I was messing around with this guy last night... means I was giving him head/ he was going down on me.
by Classy1114 October 21, 2009
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9
Depends where you are from, its different for different states, even different cities. In Vermont it means having sex, in Mass. it means anything but sex and in Maine it either means hanging out or a one night stand deal depending on what area your from.
by ellenaf April 03, 2007
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10
(verb)The act of making out or other sexual activity while not in the presence of others. The persons "hooking up" had to go somewhere else.
(1) I hooked up with this hottie after the club.
(2) Kissing someone at a bar is a bar smooch or making out, but taking them home or around the corner is hooking up.
by Auggie August 04, 2004
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11
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 12, 2015
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12
hooking upcollege
it begins with a couple drinks and ends with you sneaking out in the morning.
Bob hooked up with Carol. Carol never got the next day phone call.
by carl meier December 05, 2003
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13
to have casual sex or make out with a friend with benefit or stranger.
guy 1:"are you two dating?"

guy 2:" no we're just friends who are hooking up for sex every now and then!"
by shorty1985 May 18, 2006
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14
When two people make out (kiss with tongue) and the girl is felt up.
Sasha: Where were you and connor last night?
Gillian: Oh we were just hooking up
by sexayyygirlll October 17, 2011
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