1 definition by Hard facts101010101
Short for Fentanyl, an extremely strong opioid similar to heroin but 50x more potent. Extremely addictive and physically dangerous probably the worst drug out there
Smack head 1 'I heard there's some fenny going round right now'
Smack head 2 'man that shit fucks me up'
Smack head 2 'man that shit fucks me up'
by Hard facts101010101 October 3, 2017