Definition of "ecky"

Afterwards, Tom wanted to drive home. Francoise said he was in no state to. Tom said that he always drove home from clubs, and that the ecky wouldn't impair his driving.

1997, Barry Graham, Before: A Novel, page 45

Penman and I have taken half an ecky each, but mair coke would be sound.

2008, Irvine Welsh, The Acid House

We give you the ecky or skunk and tell you who to get it to.You get paid by them.

2014, Murray C. Morison, Time Sphere