Can be used when referring to having a beer.
Also may be in reference to smoking weed.
Also less urbanly used in England to describe having a cup of tea.

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

abbreviated form of the word brewskis, meaning beer.

One of the thousands of UK terms for tea.

The term "brew" can refer to a friend, much like brother, Man, dude and homie. This is not commonly used when referring to a person outside of their immediate presence, only when you are having a direct conversation with the person.

lancashire slang for a 'cuppa'. it can be a cup of tea or coffee.
Most liverpudlians don't understand the concept that 'brew' can mean both tea or coffee.

To brew someone means to annoy them.

This is because brewing a cup of tea let's off steam which is related to people being annoyed.