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1.
A sexual act involving 2 girls and 2 guys; similar to the Eiffel tower where both girls are making out while being done from behind by each guy. The guys high five each other to form the arc de triomphe.
Stacy, Christine, Erik, and Dave got together for a good ol' arc de triomphe.
by fireball1624 March 31, 2010
 
2.
Female version of the Eiffel Tower. Occurs when one male supports his body with hands and feet facing upwards (acting as a bridge), while one woman stands over his mouth and the other over his crotch and exchange a high five.
Dude, did you hear about when Brad and those two chicks did that Arc de Triomphe last night?
by Pat Whitman and Jake Fitzpatrick December 17, 2007