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Often used after Coolio to describe the person being spoken to as a cool boy.
Nate "yeah you can head over now"
Me "Coolio boolio"
Nate "no problem homie"
Boolio by TrashGoblin July 28, 2022
Related Words

Boolio Gaming 

Boolio was Boolio Gaming on boyfriend dungeon
Boolio Gaming by The Mysticman November 3, 2021
friend1: what's up man?
friend2: just boolin with jackie
Boolin by alyssajolene February 6, 2018
boo l-e-uh
noun
1. A rare fruit, about the size of a papaya, that grows on a remote island.
2. A clever nickname for anyone named Julia, as it rhymes.
Boolia by Nyk the Great June 25, 2017
A condition found in gyms and fitness clubs where a bro with a massive upper body habitually skips Leg Day in order to keep his pumped state in the region of his upper body.

The resultant lack of fitness to the legs leaves the Bro deformed with a monstrous upper torso and arms with tiny little old lady spindly legs.
Oh, man, Scott (because all Bros are named Scott), really has The worst case of Brolio that I've ever seen. I don't think his legs have ever done anything but walk his ass over to the dumbbell rack.
Brolio by Mastermind Excello May 20, 2015

boolin in the trenches 

When you are having a good time in the trenches in WW 1; When you are chilling with your bools in general; when you are in the trenches and you are cleaning your feet to keep clean.