someone you've just met and make an effort to talk to that takes an instant and intense disliking to you regardless of whether they have an actual reason for doing so (usually combined with glares or snide comments).
I tried to befriend Sam but she was such an insta-hater that she just iced me out before I even talked to her.
by jilljillbeanbag November 02, 2009

7 Words Related to insta-hater

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