Top definition
An internet acronym for But Then I Realized, usually will come before a punchline. (Common in Tweeter.)
Also just "TIR - then I realized" & "ATIR - And then I realized"
I was gonna go to church, BTIR there's no god
by Just Kiddin' April 14, 2011
Get the mug
Get a BTIR mug for your mother-in-law Beatrix.