I believe it's a b3tan perversion of
ROTFLMAO which apparently stansd for 'Rolling On The Floor Laugin My Ass Off'. However, ROLF MAYO is a much more visceral image.
(
Baz Fuck off,
Tue 3 Dec 2002, 0:14,
archived)
Yup, close enough,
and we've also come up with suitable images, particularly as it started with someone doing a Rolf Harris picture....
Oh, You might also see 'roffle' which is becoming the modern equivalent....
(
witchy is covered in BEES,
Tue 3 Dec 2002, 0:18,
archived)