A play on the English writer J.K. Rowling's (writer of the Harry Potter Series) name. It usually means "Just kidding, and I am laughing aloud at the same time" or just "I am currently laughing aloud".
Frank: Dude you're such an asshole sometimes, you know Sarah and I broke up last week.
Joe: I was J.K. Lolling (insert emphasis here).
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Tongue Lolling is used to describe when a girl in a hentai is fucked silly to the point her eyes roll up and her tongue hangs out like a dog. It's pretty common in hentai to see a girl lolling her tongue out as some guy fucks her brains out.
That girl was being fucked so hard she started Tongue Lolling. Fucking hot
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Witnessing something so scary, that you can't help but laugh.
Shitbrix.com
OR
Being attacked by a pigeon - lolling in fear
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One who's penis is so large it makes you nervous and you laugh out loud literally.
I tried to keep a straight face, but when he dropped his pants he was a Dave Loll!
Hilarity times ten pins and a lolling ball.
Interjection.
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If you lol out loud you laugh out loud out loud...which means you actually say lol even though you are talking in real life.
Lolling out loud exposes that you actually spend more time in the virtual world than in real life and makes you seem like a fucking loser.
Peron A: Tells joke
Person B: lol (lolling out loud)
Person A: get a life!
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Ava: boi u smell like dry beans!
Jacek: I just lolled!
Both: YAY
PUSSY FART MOMENTO!