Any form of alcohol in a non-clear container (like a hip flask) that is taken to a public event.
Kyle: "Ready to go to the concert Janice?"
Janice: "I need to grab my Trail Sauce and we can go."
The art of flawless trail shreddery
“bro did you see that guy absolute shred the trail out there?! he was killin it!”
“of course bro- it’s cause he’s got the ‘Trail Sauce’”