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1.
1. To scavenge food off others. Also used to gain alcohol at parties.

2. Being very cheap by asking "kindly" from people. With no intention of returning the favor

3. Can also be used in opposite terms. Where the cheap person refuses to give to others.
"Bro, stop mcneilling my smirnoff."

"Hey I have no money can I mcneill some off you?"
by mr-noobington January 05, 2010