1. A hardcore British mountaineer, ex-army character with a tendancy for extremely adventurous behaviour. Once fell out of a plane over the Sahara desert.
2. A slang word for pills, a.k.a, ecstacy, beans, e. Consumed in nightclubs and parties across the world. The phrase is understood to have originated around the East London club scene.
"Did you see Bear Grylls last night? He made a raft out of his own face after killing a crocodile with a spoon".
"Man, I'm totally fucked and gurning my face off, where's that kid who sold me the Bear Grylls? I want some more".