ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: tin (II) + horn
: a pretentious or boastful person or gambler having little money, power, or ability
the gambling places were … swarming with tinhorns … dockhands, traveling men — H.L.Davis
those tinhorns that spend all they got on dress suits and haven't got a decent suit of underware to their name — Sinclair Lewis