The first apostrophe in "kill'n'" and "pimp'n'"

[CJ 4 life]

Why is it that on a T-shirt I read the word KILL'N' and on a sticker the word PIMP'N' when I was in the USA? I already know that the dropping of the final G is very common, I'm talking about the FIRST apostrophe (the one between the L and the N in KILL'N and between the P and the N in PIMP'N). How is it pronounced? Because I also heard a song that rhymed "missing" with "listen". Thank you.

[Anglika]

The apostrophe within these words represents an omitted vowel, while the end apostrophe represents an omitted consonant: kill[i]n[g].

[CJ 4 life]

Thank you. Talking about the FIRST apostrophe (KILL'N), is this omission very common? Is it common only in American English? Do all the people do that?I'm very curios about this. Please!!!

[Raymott]

Thank you. Talking about the FIRST apostrophe (KILL'N), is this omission very common? Is it common only in American English? Do all the people do that?I'm very curios about this. Please!!!

I'd guess that no-one actually says it that way.
It suggests that the pronunciation is /kiln/ - like a brick pottery oven.
And I don't know how you'd pronounce Pimp'n - probably a schwa instead of /i/, but to be honest, I think the spelling is more for visual effect if it's on a T-shirt.

[CJ 4 life]

I thought of the schwa too.... I think that's the way to pronounce it written like that. Cause I just remember a song by Snoop Dogg and Dr.Dre ("Nuthin' but a G thang") in which they make "attention" (that has the schwa or even nothing) rhyme with "lynchin".