An exclamation of extreme surprise, used when writing online and not commonly pronounced, can be combined with OMG for an extra surprise/irony.
Guy: So then he grabbed his sword and STABBED HIMSELF
Guy2: WTFLOLBBQ!!

Girl: and then I opened the closet and found A DEAD BODY!!
Girl2: OMGWTFLOLBBQ!!!
by OnixNix August 31, 2010
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