a smart aleck or a wiseguy.

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.

Old person speak for smartass.

Wise-acre is essentially synonymous with the terms jerk and jackass. One defining feature is that a wise-acre enjoys comedy more than anything, and therefore an insult comic or a practical joker would be called wise-acres. It has fallen into disuse recently, but it's still there.

a group of Syracuse engineer majors that binge drink and take sexy photos of eachother in their spare time