The term pain mountain was first coined in 2008 by a young gentleman in Perth, Australia. It's a saying which suggests that the user is in a momentous amount of pain.

Pain Mountain may have been derived from equally ludicrous sayings such as "I'm on(/in) a mountain of pain right now", although who really knows.

It's a turn of phrase that brings with it a sense of patheticness and the use of this phrase is usually accompanied by sever intoxication and desperation.

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.