A person living a life of abject poverty. A lineman can often be found clipping coupons and collecting welfare checks.
WOW, Lineman! You are fucking POOR!
(Noun) A guy who remains sober enough to prevent his friend from sleeping with an ugly or dirty girl while his friend is shitfaced.
"Man, I can't believe I almost hit that! Good thing I had my lineman, Joey, to keep me out of trouble."