From world wartwo and used, usually by British soldiers, to describe the effect seen when the amunition propellant in a destroyed tank starts to ignite. The flames shoot out of any opening, most usually the turret hatches, extremely violently, like a Roman candle. This terrified tankers and as a sort of black humour they referred to it as brewing up.
Other nationalities sometimes referred to it as cooking off .. the ammunition was cooking off.
The tank was hit with an AP round and within seconds began to brew up.
To make a pot of tea. Usually used in the context of plural .. a pot of tea of several cups, rather than single cup, when you would instead say, "making a brew"
a word of expression to when you give up on comprehending someone's words of ignorance, stupidity, absurdity or are too exhausted to formulate a proper response.
Commonly seen in TikTok comment sections in replies to lazy attempts at humor, overconfidentally incorrect statement, or an over-the-top comment or when someone completely misses the mark on something.