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1.
Manhandling the "open here" spout on a milk container so badly that one has to resort to the 'illegal' side.
After lactomangulating the milk carton, I switched to the other side and cut the top off.
by Miss Spunky August 20, 2003
 
2.
The act of making a mess of opening a cardboard milk carton, forcing you to use scissors to cut the innappropriate corner.
Bloke 1- "So, how was your day?"
Bloke 2- "Terrible. Plagued by lactomangulation, and my dog died."
by Mr Ned September 15, 2005
 
3.
when you are trying to open up a carton of milk and it is so difficult that you either shred it or have to resort to the "illegal" side
oh man, you sure lactomangulated that carton of milk!
by Nick McQ August 14, 2003