Referring to the left breast of a female; the left breast is often interpreted to be inferior the right breast. Comparisons are often derogatory. It can be also used as an alternative to "I don't give a crap" or "I don't give a shit".
I don't give a left tit that your show is on, I'm watching the game!
Your little brother is way more annoying than mine. What a left tit!
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