Rosetta Bone 

A one night stand where participants do not share a language. And, in theory, you each leave the encounter having picked up a term or two.

Girl 1: "Did you really Rosetta Bone that Swede last night?"

Girl 2: "Ja, hela natten!"
(Yes, all night!)

Rosetta Bone by TRikki February 11, 2014

Rosetta Boned 

When you bone someone while speaking to them in a language learned through Rosetta Stone.

Dude, after using Rosetta Stone for a few months, I Rosetta Boned the Swedish yoga instructor.

Bro, I Rosetta Boned her so hard, she started speaking French.

I got Rosetta Boned last night and started speaking in tounges!

Rosetta Boned by poopoo23oolala October 10, 2011