the act of one woman engaging in sexual intercourse with two males at the same time, the two guys start out facing each other with the girl in between them and facing one leans forward as one man enters from behind while she gives the other a blowjob. a fist bump between the men must occur while in this position in order to create the arch.
1st gentleman; Hey man she's down for the threesome, let's Eiffel Tower.

2nd gentleman; Dude, show some class.... let's gateway arch!
by sternoinferno February 11, 2013

1 Word Related to gateway arch

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