frontload, v. — Green’s Dictionary of Slang

frontload v.

[SE frontload, ‘to concentrate a load at the front of (a vehicle)’ (OED)]

(US campus) to get drunk before attending an event where no alcohol will be available.

1997–2000		Da Bomb 🌐 11: Frontloading: To go and drink a lot in a short period of time when going to an event where no alcohol is served.
1999		Eble Campus Sl. Nov. 4: frontload – drink at home prior to going out for the evening: ‘Getting drunk at bars is so expensive. We should frontload before we go out.’.