The Collaborative International Dictionary of English v.0.48:
Tommy \Tom"my\, n.
1. Bread, -- generally a penny roll; the supply of food
carried by workmen as their daily allowance. [Slang,Eng.]
2. A truck, or barter; the exchange of labor for goods, not
money. [Slang, Eng.]
Note: Tommy is used adjectively or in compounds; as, tommy
3. Same as Tommy Atkins; -- a shortened form. [Colloq.]