It's means exactly what the word implies; you bite your tongue.

Usually this happens when you're talking to fast or while you're eating too quickly or something. It's hurts like a motherfucker, and the pain literally goes through your head. It's way worse when you bleed and then it swells it up, and whenever you brush the tip of your tongue against you're teeth, you could actually feel the cut.
girl 1--Shit, I just got a tongue bite from chewing my gum.

girl 2--Oh man, that sucks. I hate when that happens to me.
by spunkychick October 29, 2010
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Adjective used to describe when someone's words are exceptionally hurtful, cruel, or insensitive. Applied to a situation/remarks through ownership: your, his, her ; "Your biting tongue," "he has a biting tongue."

Definition of 'BITING' as an adjective: vicious, harsh, cruel, savage, cutting, sharp, bitter, scathing, caustic, acid, acrimonious, acerbic, stinging; vitriolic, hostile, spiteful, venomous, mean, nasty; informal bitchy, catty. ANTONYMS mild, gentle.
"When provoked, he had a biting tongue."

"Her biting tongue became more vicious after a few beers."

"Your biting tongue caused an uncomfortable atmosphere after your argument with the waiter."
by Scarysmurf April 1, 2010
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