piker

noun

• A soldier armed with a pike, a pikeman.
• One who bets or gambles only with small amounts of money.
• A stingy person; a cheapskate.
• An amateur.
• One who refuses to go out with friends, or leaves a party early.

  "Mate, don't be a piker! Come to Angie′s birthday party tonight!"

• One who pikes (quits or backs out of a promise).
• A male freshman at Cornell University.
• A tramp; a vagrant.