bub

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Used as a term of familiar address, especially for a man or boy.

from The Century Dictionary.

• noun A substitute for yeast, prepared by mixing meal or flour with a little yeast in a quantity of warm wort and water.
• noun Strong drink of any kind; liquor, especially malt liquor.
• To throw out in bubbles.
• noun A woman's breast.
• noun A boy: used in familiar address.

from the GNU version of the Collaborative International Dictionary of English.

• noun Cant Strong malt liquor.
• noun A young brother; a little boy; -- a familiar term of address of a small boy.
• transitive verb obsolete To throw out in bubbles; to bubble.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun slang, historical An alcoholic malt liquor, especially beer.
• noun A woman's breast.
• noun A term of familiar address; bubba; bubby.
• noun Australia, slang A baby.
• noun slang champagne; bubbly.
• verb obsolete To throw out in bubbles; to bubble.