Questions about example sentences with, and the definition and usage of "Tt"

A: Do you mean tiktok? TT is usually a shortened way to say tiktok

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A: ti ti

A: T-T which symbolizes crying

A: Like the sound ("tt" in "Matt")? Or as an abbreviation for something?

A: Like a normal 't' or a 'glottal stop' in British English.
Like a flap 't' or flap 'd' in American English.

Simple, but not 100% accurate way -> pronounce a 't' or a soft 'd'.
Two 't' -> tt are not longer or stronger, they just go together.