me and my friend usually use skateboarding tricks... really simple:
"we should go and do some ollies"- we should go have a toke
"i should probably pick up a skate mag tomorrow"- i should but some weed tomorrow
"lets go skate"- lets go get baked
"hey, you got any good stickers?"- hey, you got any good weed

this usually works around the parents cuz they dont know what we're talking about for a definate... and it works great since im only 15 and i'd get in a bunch of shyt