What is Steamloller?
1.
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."
2.
A steamroller containing the substance of 'lol'. Suggests hearty lollerin'
"Steamloller!"
See