A 2 step process where a girl makes or buys you a sandwich, then gives you a blow job as you eat the previously mentioned sandwich.
"Cindy came over yesterday and gave me a lunchkin."
by Be and Jay August 31, 2008
1 more definition
a person who tends to gluttonously have much of a lunch.
I won't take you out for a lunch. You are such a lunchkin.
by uttam maharjan 1 July 28, 2014