An Australian term used to describe someone who has taken excessive amounts of ecstasy (Pingers). This can often be identified by; enlarged pupils, uncontrollable jaw gurning/licking, excessive sweating and a lot of shit being spoken.
guy 1: Bro are you alright you look like you're having a seizure.
guy 2: I'm sweet bra just fucking munted as aye!!!
To be totally drunk. Although this is traditionally a word used by the English; Americans alike have been using the term more frequently due to the use of this word in the hitBritish film Suan of the dead.
Suan's co worker "hello, aye mate. yeah, yeah i gottotally munted last night....... continue"