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To laugh at or with someone but at something more funnier than a "lol"
I just fell in dog poo !

Oh that's brilliant! Lolatt!!!
by Dillydoodah September 23, 2010
To laugh AT someone as a pose to laughing WITH them.
Limes: "Hey that sounds very satisfying! Er......care to come round here after your sandwich Sarah so you get a double dose of satisfaction?"

Stu: "LOLATT *sniggers*"
by StuPhipps September 23, 2010