Lul

[Tina]

Dutch word for...ahem...penis. But also used by some internet users as abbreviation for laughing out loud usually abbreviated in LOL.

[Couch Potatoe]

LUL : Lame Uncomfortable Laugh

Internet slang term, derived from the popular LOL (laughing out loud).

Usage of LUL is typically reserved for situations which make you feel uneasy.

[Becky]

A Popular twitch emote used instead of LOL

[Tina]

dutchie calling you a dick(head)

but not so offensive.

[Justin Bieber]

Replacement internet lingo for lol (laugh out loud)
Some weirdos say lol in real life - and if you do an impression of someone saying lol out loud you write it as lul.
OR
if you are talking about a n00b who was loling it up all day you would say how he kept luling all the time.

[Sarah]

A variation of lol, when lol has been overused in an online conversation

[Sarah]

Laughing uncontrollably loud

[Donald Trump]

lightly undulating laughter - a texting abbreviation revealing a chuckle occurred in real life, a sly chuckle, or hehehe