A gun. Usually referring to a pistol or a short barreled rifle/shotgun.
You niggas know I always keep that fuckin tool on me.
A person with an inflated opinion of and genuine belief in his skill/prowess/intelligence who takes every opportunity to remind others of it, regardless of the skill he actually possesses. A tool may or may not actually be smart, and may also be disarmingly superficially pleasant; these attributes are irrelevant.
(1)
Tool: Hi! Nice to see you.
Unfortunate Acquaintance: Hey, you too. How's work going?
Tool: Pretty good. My team isn't quite as up to speed as I am, but I've been taking time out of my busy day to lend help and guidance to those less gifted than I. I've been pulling the whole weight of the project so far. It's a good thing this is my area of expertise.
Unfortunate Acquaintance: I think I'm allergic to you.
(2) see the video resume "Impossible is Nothing"
Tool" is just a slang term for penis. It also has other meanings like Calling someone a "tool" is a less profane way of calling them a "dick" or "cock" or "prick". Or a asshole
1: yo bro stop being a damn tool and throw away your fucking trash man.
2: Me and And Ashley had sex last night I put my Tool in her :)
a tool is the word for some one stupid, often used in ireland
boy 1 "where did you say the ice cream was?"
Boy 2 " over there you fecking TOOL!!!"
Someone who lack's mental capacity. a retard; a idiot.
You're a tool.
" wow, that guy doesn't even know what he is doing "
" yeah , what a tool "