From WikiTemp, the GBAtemp wiki

yuyuyup has a ds. He also smokes marijuana. If you want some marijuana he probably can't get you any as all his sources for it suck serious ass. He buys dirtweed for $50 an eighth. To most thats dumb as fuck. but for yuyuyup this is the only marijuana he can find to smoke. So if you have spare high grade marijuana, you can take compassion in providing some to yuyuyup. Afterall, he has been smoking nothing but schwag and would probably suck your dick for high grade THC lased hash..