tits by default. when a fat chick talks about how big her boobs are you say she has tbd.
"My boobs are huge"-Zoe
"Your also fat"-Emma
"WHAT?!?!"-Zoe
**cough cough** "TBD" **cough cough**-Emma
by tkmtqueen July 4, 2011
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Acronym, standing for Titties by Default. Refers to the massive protrusions of fatty tissue present in the chest area of overweight women, and occasionaly men. Not to be confused with BAT's (bomb-ass titties), Titties by Default are not composed of breast tissue, but rather an inevitable dispersion of fat cells throughout the bodies of those afflicted. While TBD's are responsible for giving fat women a false sense of confidence and self worth, they are equally capable of deceiving unsuspecting onlookers, and masquerading as BAT's.
Stel: "Holy shit, that girl eating the nacho plate to herself has PHENOMENAL breasts. I can't stop staring"

Me "No dude, they're TBD's. If I was 3 bills I would have phenomenal breasts too."
by porneggs November 9, 2010
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As in "To Be Determined". The excess fat, chunkyness, fluffyness, or plumpness on a person's body. Typically located in the midsection area of the human body blocking the abs.
Matt: Dude, you really need to start exercising.
Ricky: Yeah, I guess it's time to start figuring out what I'm gonna do with all this TBD muscle.
by Breaston December 14, 2009
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Hop on this dick its time to do gay shit in the name of being a homie
"Hop on tbd". "Sure what gay shit we doing today?"
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A guy named tbd 101 who beats his cock to lana rhoades every day also found in discord.gg/twitter mainly
TBD/YE Was Caught Beating His Cock
TBD/YE Likes Kanye West
by noahrana October 12, 2021
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