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Refers to a man or woman of short and portly stature. In many fantasy books movies and games, a dwarf/troll or the like, are highly susceptible to magic spells. An indirect way of calling someone a troll or a dwarf.
That woman is weak against magic. Surely her physical attack is quite strong.

-"So how was your date last night?"
-"Well, he'd be weak against magic, if that tells you anything."
by Gelgalar October 17, 2011