1. (noun) Delicious combination of hot sauce, mayonnaise and other secret ingredients that is used as a condiment on subs created by the Shortstop Deli in Ithaca, NY.
2. (adj) an act or thing that is of a high degree of excellence.
1. "Dude, you have to get truck sauce on that PMP sub".
2. "Did you see that dunk by Lebron James?" "Yeah dude, he's the truck sauce".