Noun
CKIN (uncountable)
(travel, aviation) Abbreviation of check-in.
Starting with, "In the words of Snoop Doggy Dog, one of our country's most distinguished luminaries, 'If it ain't one thing, it's a muthaf*ckin' 'nother'. Source: Internet
"Jules, if you give that f*ckin' nimrod fifteen hundred dollars, I'm gonna shoot him on general principles." Source: Internet