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1.
Descending from the snooker player Robert, 'Milkins' is used to describe something that is of great joy or when a high level of skill is used. Only created in the past year 'Milkins' has quickly spread around the Edinburgh and surrounding areas, particularly the WOL and ELBA.
"That goal was Milkins"
by Dean Thomson July 25, 2006
 
2.
An expression used to highlight something which is good.
"This sticky ganja is milkins."
by Ross Douglas July 19, 2006