Mad yin
a mad one; having a wild time.
"on a mad yin"
mad yin
when a scottish cunt goes on a absolute bender. classified by - not going home between the days Friday and sunday night, more than 5 gram of gear must be consumed, minimum 5 swaggers (eccies), atlas 2 bottles of buck and/or a swift litre of scotlands finest glens (ket, mandy and bubbles also recommended to fulfil your mad yin)
"am going on a fucken mad yin this weekend davie" or "fuck me a need a heavy mad yin after this week"