“Every kiss begins with K” is one of many one-liner comeback jokes, that can be expressed after someone audibly releases a bellowed cloud of flatulence, or any other related type of cacophonous din.
Agent Oh: “Harder Daddy!”
Agent K: “Sure thing, boss lady.”
Agent Oh: (releases a fart from queefing)
Agent K: “Every kiss begins with K!”
Response to the phrase "get a room" when wildly making out, inscenuating that the accuser is being hypocritical, thus causing them to mind their own business.
"Hey you two, get a room!" says Jess. "Oh haha, every room in the house, Jess!" says Anna, then Jess slinks away powned.
1) A guy who is so nice to every girl he knows that before he knows it, everyone is past the "Friend" threshold and thus impossible to date due to the "I don't want to mess up what we have" argument.