Pre-Pack

Verb: To pack a bowl of marijuana ahead of time so you don't have to worry about doing it when it comes time to get stoned.

You: I feel like getting high, i'm gonna pack a bowl.
Me: Don't even worry about it, i pre-packed one earlier today.

pre-pack

to pack items for a trip, then you discover you still need them and have to dig them back out.

He pre-packed his clothes three days too soon and had nothing to wear.