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 April 1, 2010
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A practice in which an individual deffecates on a toilet seat when it is down, and thereafter forcefully slams the toilet seat up against the opposite wall.

Due to the impact of the toilet seat and the wall, the feces is distrubuted in a circular pattern on the adjacent walls and ceiling, creating an "arc".

First introduced in France during the interbellum period as a reactionary movement against increased bread prices, the practice is gaining in popularity thanks to short video reels published on "TikTok", a social media platform targetted at youth audiences.
Wow, sick Arc de Triomphe in your grandma's bathroom dude!

$7.99 for a singular loaf of bread? I'm going to arc de troimphe the hell out of this nursing home's bathroom!
by ArcLover June 11, 2023
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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?
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A beautiful position between 1 male and 2 female specimens. The male individual lies face up with 1 girl riding his face and the other girl riding the male's schlong; while the women passionately snog. The creation of an arc portrays the infamous Arc de Triomphe.
"Bro did you hear about Andre and his beezys... He pulled 2 of them at the same time off of Snapchat and managed to undertake the Arc de Triomphe!"
"NO WAY... Andre's such a legend."
by lilpussyass January 11, 2023
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