A joke that is so funny that when all laughing has finished you feel as if you have been run over by a steamroller. You have trouble breathing, your chest hurts, smiling causes pain and the like.
"Oh man. That was a steamloller."
by Ethan Feldman July 17, 2005
2 more definitions
A steamroller containing the substance of 'lol'. Suggests hearty lollerin'
by steamloller March 13, 2003
"laughing out loud" so hard steam comes off the top of your head
OMG that was so funny, i steam lollered!
by Shambler August 26, 2004