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TIR is an internet acronym for Today I Remembered or Today I Realized, for when you remember something from the past or have a sudden awareness of something. TIR is similar to TIL (Today I Learned) but often indicates past knowledge or exposure to the information.
TIR an awesome cartoon from my childhood.

TIR how to write the letter "G" in cursive... and that we never used cursive in high school.
by zants December 20, 2011
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Basically a tear but much more specific and disappointing.
Man them tirs soaked my shirt I feel like I'm wearing sadness.
by Feelmytirshearmydeetdeet April 02, 2015
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tir is and acronym used in a common song. "T is for tits and taco bell. I is for indians drunk as hell. R is for raunchy nigger smell and that spells the word tir."
by lollypopping March 12, 2010
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A geordie phrase, most often associated with the Newcastle Royal Grammar School, which means "cigarrete", or "to smoke", sometimes used in a derogatory manner to describe someone or something, or just as a proclamation.
"Aye I fancy gan' out for a cheeky tirs"
"Oh tirs" (a statement of disdain and displeasure"
by thef(x)thatmockscalculus January 14, 2016
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