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Simply, the acronym or 1337 version of "R u fucking kidding me?"
Dude 1:Dude, wtf, he just pwned the whole terrorist team.
Dude 2: OMFG! Rufkm? H4X!
rufkm by BRow May 2, 2006
Related Words

fetch with ruff ruffman 

A children's show on the Public Broadcasting Station (PBS) filmed in Boston, Massachusettes. the show consists of a cartoon dog named Fetch who sends 6 real children ages 10-14 around to Boston area to do challenges to earn points. at the end of the season, the kid with the most points is the fetch grand champ and gets a prize.
My cousin never misses and episode of Fetch with ruff ruffman because she thinks Noah and Rosario are cute.
"Are you fucking kidding me right now?"
Heh, rufkmrn?!
rufkmrn by laydiyah July 10, 2020

The Ruffmanian Cult 

Group of devote people who praise and worship their Supreme Leader Ruff Ruffman. This group tends to meet 5 times a week and pray for about 16 hours daily. Their common beliefs consist of Ruff Ruffman was the matter or object that existed before the Big Bang. He created this world stay with us on earth. Created an amazing TV show to educate his children. Then some non believers at the HQ of PBS kids had his show taken down. To this day you will find members of this group sitting around their TVs at 4:30 PM Central Time in rememberance for whenever there lord use to educate them every day at this time.
Hey are you going to the Ruffmanian Cult meeting tonight
The ruffest man in all of the endz
David shanked one breah, he's definately a ruffman!
Ruffman by Skengman June 16, 2009
Short for "Roll On Floor With My Girlfriend" can be ROFLWMB (boyfriend)
i Rofwmg'd last night
ROFWMG by Speshtard November 2, 2009