Tune-up: That's when the mechanic sets your engine to rights with two sharp whacks from a small non-marring hammer: Nup! Nup! Two nup. Simple!
Update: Tam points out that prior to a two-nup (or a three-nup, for more severe cases), it's probably wise to sign a pre-nup agreement.
T. R. MCELROY'S STREAMLINED TELEGRAPH KEYS
2 months ago