Bub/bʌb/ Definition 1 of 2Pro Tip 1/3Informal Address Use 'bub' in casual conversations with friends, not in formal situations. Great job on the game, bub! Pro Tip 2/3Masculine Tone 'Bub' carries a masculine feel and is typically used when speaking to males. Hand me that wrench, bub. Pro Tip 3/3Familiarity Needed Don't use 'bub' with strangers; it's better suited for acquaintances or friends. Could you pass the ball, bub?