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COBA or "c.o.b.a" is an acronym that stands for: Check Out By Association.

a "COBA" (pronounced: côh-bá) occurs when an attractive person is associated with an ugly or "unattractive" person, and said ugly guy or girl gets checked out, just because he/she is physically with a good-looking or even "hot" human being.

A COBA is a very tricky thing, if a COBA is initiated and the ugly person (who is usually checked out last) believes it was for their own looks, it may give the ugly one a false sense of confidence, that may lead to terrible choices of fashion; in clothing, hat selections and even worse, terribly unjustified arrogance. But, when COBA is noticed for what it is, the unattractive person can instantly return to his/her cyle of quiet self loathing.

Whether it be for selfish reasons i.e: making themselves look better in comparison (see also; duff) or the more noble paths: need of wingman/wingwoman, actually likes ugly person as a person: the better looking person always has a reason to be with their homely counterpart. Someone who has done a COBA can read the bond between the two, then analyze it from there.
David: "Bro, that cutie in the brown dress just totally checked you out!"

Juan: "No way man, she is SO not into fat dudes, plus, she friggin' eye-raped you first, that was a total COBA"

David: "a what?"

Juan:" a C.O.B.A!: check out by association, she checked you out cos' she wanted to, and me because she wanted to try to comprehend our friendship, and/or why you'd hang out with an ugly guy."
C.O.B.A by John Kings jr July 11, 2009

B.A.T.O.B. 

Booty And Tig-O-Bitties

basically if a girl has a booty and big boobs thats what she is....BATOB...its a nickname more or less...
hey B.A.T.O.B....my friends call me Batob its my nickname...

S.O.B.A.R. 

Jack is so S.O.B.A.R. right now!
S.O.B.A.R. by JackLB October 24, 2011
Baddest of all time
“I’m the B.O.A.T”💜
B.O.A.T by Jamiaaaa3 October 14, 2017
Is simply a Tweaker On a Bike.
We have all seen them rolling around town all hours of the night dumpster diving and what not.
Dude did you see that T.O.A.B digging through the dumpster??
T.O.A.B by InfamousBigRob October 3, 2013

B.O.A.T. 

Biggest Of All Time in referring to a shit. Poop that looks not only inhumanly possible, but also makes you want to show everyone in the house. Nautical references also apply, as it looks like you just shit a yacht.
Me: "omg Mom, come look at this poop!"

Mom: "son you just shit a B.O.A.T."

"That shit was literally the biggest of all time"
B.O.A.T. by Captain Ish August 16, 2009