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When a guy comes 90 degrees and a girl comes 10 degrees in order to proceed with ''getting it''.
"lemme get dat 90/10 gir!"
90/10 by Dirty D333 November 29, 2009
The perfect ratio of 90% preppy and 10% thug, like most west seattle boys. Any more either way, he's no good!
He's more of an 80/20 than a 90/10, can't take him home to mom and dad!
90/10 by TSAO May 11, 2008
Codeword for 90% attention-seeking, 10% attention-giving. A 90 10 is someone who goes out of their way to get the attention of their peers, much like a pick me. They tend to be egotistical, overdramatic, and above all, fake.

A 90 10 can also falsely create attention around one of their quieter peers in order to try and guide attention back to themself, or alternatively poke fun at a bystander for extra draw.
Polly: "Ugh, you see Bart frolicking over there in front of that crowd?"
Eustace: "Totally. What a 90 10."

Jack: "Hey guys!! Look, look, Polly looks like a clown!"
Eustace: "90 10..." (referring to Jack)
90 10 by tomschmoll December 14, 2022
When someone bends you over 90 degrees and fucks you in the ass 10 inches. In other words, getting fucked over.
Denise told me she could get us into that new club on Saturday, but then she gave me the 90-10 by sticking me with both of our covers.

Lisa gave me the 90-10 when she set me up on a blind date with a total tool.
90-10 by Purple-CE January 4, 2008
when a girl leans in 10% of the way, showing intrest, and the guy leans in the rest of the 90% to kiss her
the 90-10 works every time!
90-10 by lanabdoslqmoaala May 18, 2015

90 10 100 Rule 

The rule which states that...

90% of the time a person is no more than 10km from their home, and 100m from their car
I couldn't find you anyware, you broke the 90 10 100 Rule.