เกรียน

Adjective

 * 1)  very closely cropped.

Noun

 * 1) crew cut.
 * : the plant of the family.

Etymology 2
From the fact that Thai schoolboys, who are statutorily compelled to wear crew cuts, are often seen behaving ill when playing online games.

Noun

 * 1)  troll: one who makes a deliberately offensive or provocative online post; one who acts in a deliberately offensive or provocative way.

Verb

 * 1)  to troll; to behave like a troll; to act as a troll.

Adjective

 * 1)  trolling; like a troll; characteristic of a troll.