a brand of small chocolate-covered mint with a creamy peppermint center.

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.

Candy which is composed of a creamy, mint-flavored goo covered in solid chocolate.

Junior Mint is a term of endearment for the newly-minted, smart-as-a-whip, hand-raising, go-getters that are in the early stages of their careers and that no team/company/non-profit/group wants to be without. Junior Mints are rock stars and will likely PWN you one day.

something you dont want inside of your body during surgery

A younger man, usually well-off, who financially supports an older man (or woman) in exchange for sex and companionship. Derived from another confectionery-based term, it's the reverse of Sugar Daddy. The 'junior' refers to his youth; the mint part means money.

the greatest way for teamwork to happen...sharing junior mints (in the movies)