I could not offhand expand BTC or CUL. I recognize “that slaps” or “it’s really slapping”, but not SLAP taken as a four-letter acronym or initialism.
[Presumably not this technical answer: What does slap stand for?
Overview. A SLAP tear (SLAP stands for superior labrum anterior to posterior) is an injury to the labrum, the fibrocartilage lining the shoulder socket that the humerus (upper arm bone) fits into.]
Comics I Don't Understand 
Is the Mutts a reference to the sphinx breed of cat?
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I only know about half of those texting things (as they are used today).
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I could not offhand expand BTC or CUL. I recognize “that slaps” or “it’s really slapping”, but not SLAP taken as a four-letter acronym or initialism.
[Presumably not this technical answer: What does slap stand for?
Overview. A SLAP tear (SLAP stands for superior labrum anterior to posterior) is an injury to the labrum, the fibrocartilage lining the shoulder socket that the humerus (upper arm bone) fits into.]
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SLAP = Sounds Like A Plan
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CUL = See you later?
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If CUL is “See you later” that would fit with how come “See you next Tuesday” must be avoided in polite company.
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