Left over, watery liquid residue following a bum wee. Can be mixed with sweat in its fermented state. Often, when over saturated, trases of urine can also be found in the brew
Cor, Ive got awful bum brine after those singha beers and house special vindaloo last night
A bum ramble is when one violates your bum crease area through clothing with their finger, at any opportunity. For example, when you bend over to pick up an item, or you’re innocently walking up the stairs in front of a friend