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1.
Represents team work and togetherness between individuals.
Has its origin from the Filipino verb "to be together". Mag Kasama Tayo sa SM = Lets go to the mall together. Used as the team saying by R.J. Reynolds Ladies Basketball Team of 2008-2009 in Winston-Salem, NC.
Group of people chattering and arguing amongst each other.
"Kasama yall, Kasama," someone says from behind
Group of people chattering working on a way to work together.

RJR Basketball Team: Kasama on three. One, two, three, Kasama!
Coach: Lets play together! Kasama!
by Team Player December 20, 2008
 
2.
Another name for a betch. Usually referring to a skanky gay asian boy. A Kasama tends to give the stink eye for no apparent reason and without warning. Kasamas tend to have an entourage of fag hags whom are equally as much of betches as the Kasama is, so try to stay clear of them unless you are looking for trouble.
Don't be a Kasama!
Kasama, please...

Amy: You'll never know what this queen did to me today.

Kim: What happened?

Amy: I was on my way to get fajitas and he was sitting in the booth across from me and he just plain up and gave me the stink eye for no apparent reason!

Kim: What?!? What a dirty Kasama!

Amy: THAT'S WHAT I SAID! A major Kasama...
by RockinAims May 28, 2008
 
3.
A brother. Used as in "my kasama" by Seattle rapper MC Geologic. Rooted in the Filipino verb "to be together"
"Peace to my kasamas"
"what's up my kasama"
by theloniousskunk October 04, 2014