Top definition
It is an abbreviation of 'I like rainbows so much'.

Basically hitting the keyboard and coming up with that.
1:dude, lamfo!

2:ilrsm mann!

1:wtf does that mean?

2:aw sorry i just hit my keyboard randomly
by bleekers4u September 18, 2008
Get the mug
Get a ilrsm mug for your barber Bob.