Top Definition
a man and woman are on the top bunk of a bunk bed as their friend is on the bottom bunk. While their friend is asleep the male penetrates the female (intercourse). Before the male finishes he climbs down to the floor and finishes in his friends face. Sort of like Brokeback Mountain, hence Slimy Montana.
Sal and Emily are on the top bunk as Jimmy is asleep.
Sal gets very aroused and pulls out before giving Emily a cream pie.
Jimmy gets it in the face when Sal gives him a slimy Montana
by mountainman13 December 11, 2013

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