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1.
TYBG is an abbreviation of 'Thank You Based God'.

It's a way of showing your thankfulness to Bay Area rapper Lil B The Based God.
Lil B: "I f*cked your b*tch."
Me: "TYBG! You could f*ck my sister too."
by Amsterdamaged April 30, 2011
 
2.
An abbreviation of thank you based god.

Thank you based god is an expression used when something really great happens, and the user is referencing the ridiculous rapper lil b, who calls himself the based god.

See: based god, lil b
You find $20 on the street- "THANK YOU BASED GOD"
You find a bag of fresh new doritos behind the fridge- "TYBG"
by goblin666rotfl May 19, 2011
 
3.
TYBG - Thank You Based God
Comes from fans thanking rapper Lil B's alter ego, "Based God" for things ranging from finding $20 on the ground to having Lil B fuck their bitch. TYBG can be inserted in place of any congratulatory remark.
Guy 1: Obama just won the election!
Guy 2: TYBG

Guy 1: I just aced my english exam!
Guy 2: TYBG
by Rotchkiss May 12, 2011
 
4.
Stands for "Thank You Based God" referring to rapper Lil B as he also goes by the nickname "Based God" and has a cult following fan base that can be heard yellin gthe phrase whenever something good happens.
Fox News: Osama Bin Laden has been killed today by US forces in Afghanistan.

Fan: TYBG!!!!!
by AltaiThaKing May 21, 2011