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1.
to be hit right on the very top of a nipple by a dart
Man, I was playing darts with the guys at the bar and one of my friends accidentally mountain topped some guy, he had to go to the hospital to get the dart removed
by ThatGentleman January 25, 2011
 
2.
The act of being pelted with a throwing dart uber hard. ( coming from the zoosk commercial banned in select areas).
Did you see that commercial where that guy yelled" MOUNTAIN TOP!" and hit that dude in the chest with a dart????? lol it was hilarious! he got mountain topped
by gooserobber January 20, 2011