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2.
The simple act of mounting a female.
Hey bro you gonna mount up with that cute little blondie?
by The Sneaky Shafter November 27, 2009
 
1.
Exercise involving 2 partners where the first person lies in a plank with arms locked out and the second person planks on top of the first. Plank on plank action.
Crystyle the Warrior Trainer: Get a partner! Mount up! If anyone drops, we are doing it all over again!
by whoknew! March 25, 2014