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pronebone 

To have sexual intercourse with a person who's lying on her (or his) belly. More precisely, to "bone" a "prone" person.
Then she turned round on the bed and spread her buttcheeks, so I started to pronebone her like a madman!
pronebone by wah wah wee wah January 13, 2009

proneboning 

bb: do you like proneboning?
P: the csr didnt ask me but they did to another t-mo user
P: proneboning is not yet defined
P: via urbandictionary
bb: do you know what prone bone is?
bb: boning a girl that's in the prone position
bb: add it
P: lol
Please see above for an example of proneboning.
proneboning by iphungy December 25, 2007

pronobono 

when you fuck a girl laying on her back while youre doing a handstand
pronobono
pronobono by JonathanHitchcock December 13, 2022