A person who considers a gift and tries to guess weather it's been regifted or not, if they decide it is, they then snub a gift/slag off the giver to others, regardless of proof. Regifting is dificult to prove.
A. "That Hat I got from Ben was regifted, the tight arse."
B. "You're such a Regifting Snob, It's the thought that counts, leave him alone."