noun
freeloader; scrounger; sponger
Colloquial term for someone who habitually gets money, food, or favors from others without giving anything back.
彼はいつも人のおごりで飲んでる、たかり屋だよ。
He's a freeloader who always drinks on other people's dime.
たかり屋にたかられて、財布が空になった。
I got sponged off by a mooch and my wallet ended up empty.
たかり屋 is the noun form derived from the verb たかる (to swarm, to sponge off). たかり屋 specifically refers to a person who engages in this behavior.
Compound of たかり (continuative form of たかる, 'to sponge off') and 屋 (suffix for a person with a certain trait or occupation).