noun
cheeky, vulgar brat; impudent young temptress
Internet and otaku slang for a young female character who acts brash, sexually provocative, and looks down on others, often with a mocking tone. The term is vulgar and carries a strong derogatory or fetishistic nuance.
あのメスガキキャラは、いつも主人公を見下して挑発してくる。
That cheeky brat character always looks down on the protagonist and provokes him.
ネットでメスガキのイラストがよく話題になる。
Illustrations of impudent young temptresses often become a topic online.