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1.
The lolspeak version of for serious?, used in situations when you're in disbelief of what someone is saying, or are questioning the seriousness of the said statement.

Derives from fo sho and srsly srs.
person 1: w00t! i just won a car!

person 2: :O fo' srs?

person 1: yeah, srsly!
by abcdevenny May 31, 2011