An abbreviation of "Thin Blue Line."

Too Busy Laughing- a cooler substitute to lol

The short-handed version of "The Bread Line". They are a YouTube channel who plays a lot of indie games and provides many people with entertainment.

TBL is an abbreviated version of "the bum lord" bum lords are fat fucking slobs who finger there asses

T.B.L. (Today Boomer Learned)
Spin on popular term TIL (Today I Learned). Used when baby boomers learn about modern day concepts.

True Bentley Lad. A fine group of famous musketeers renowed for boozing hard where ever their feet may stand. If you wish to take part in this natural phenomenon you would have to take in a series of challenges in order to over come the initiation stage and become a full on tbl.

The lines made on a t-shirt between a girls breasts.
TBL stands for T-shirt boob lines.