What is Ftbrg?
1.
Stands for "Fuck That Butt Real Good"
originated from a goon story from SA forums.
UT: Im off to see Amanda again, were going to "hang out"
GS: You go man and make sure you FTBRG
See 
2.
to Fuck (or fucked) that butt real good
He really FTBRG last night.
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