A person of Irish decent, whilst in the vicinity of crushible objects (including other humans) upon a bed, rolls over in a drunkedn stupor, therefore crushing (or steamroller) said object.
Holy shit! Forch is so tanked. She just crushed that box of tissues on her bed... She's such an Irish steamroller. I'm never asking her for a tissue again.
A sex act where a gentleman releases a stream of urine into his partners asshole while that person has their buttocks angled uniquely in such a way to recieve the piss into their gaping rectum. the stream of piss is what resembles a streamer. (Note: originated by the Greeks, Stolen by the Irish.) The Irish Streamer is usually initiated by the subject exclaiming "PISS IN MY ASS!!!"
When a person inserts a Baked Potato in their rectum, and someone else gives them anal sex. The Potato becomes mashed and then the person promptly shits out the mashed potatoes into the other persons mouth.
"YoNick my girl just gave me an Irish Steamroll how awesome is that"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi