Semantics, Schemantics

this really cute ns guy was checking me out yesterday.

qn: what is wrong with the above sentence?
ans: subject-verb agreement

let us examine clause 1.
firstly, there is no such thing as an ns men who's cute. i've known enough of those to draw the conclusion that there is no such thing as a "cute" ns person.
and secondly, i believe all girls will agree with me on the point that if you are a guy living in singapore, you are NOT cute. the possibility of you being "cute" is immediately and naturally reduced to zero.
therefore, there is no such thing as a CUTE. NS. GUY.
moving on to clause 2.
unless preceeded by a negation, the phrase "checking me out" can NEVER follow the word "guy".

and thus, since the subject ("cute ns guy") and verb ("checking me out") cannot agree, the above sentence cannot exist.

let's practice on another example:
this really hot indian guy signed up for lion dance last week.