What is 'lock?
1.
Abbreviated version of "polock", slang term for person of Polish descent.
Person 1: "We're making pierogies to celebrate your 'lock heritage."
Person 2: "Don't forget to put sour cream on them, or else they aren't fully 'lock."
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1.
similar to jammy bastard...a lucky stiff.
"You spent all night whacking her? Jammy beggar."
See jammy, bastard, beggar, luck..