An affectionate form of address, usually said by a man to another man, indicating your level of comfort with that person is equal to that of an old, well broken-in boot (as opposed to a cramped, new shoe.)
Thanks for letting me borrow your car, and loaning me gas money.
No worries, old boot, we go way back!
No worries, old boot, we go way back!
by Kushi-Kat February 06, 2012