We call our weed Richard. Short for Richard "Gear." Pretty easy to slip into conversation when you're on the phone trying to organise a sesh or something. "Hey man, wassup? Gonna hang out with Richard after work today. You down?"

Got a lot of others but that one's our favorite.

edit: When we buy though, it's always just in sizes. "Hey bro, how about a 7? Could do a 14 if you've got?"