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1. Particularly weak, meek, or unimpressive; wimpy. No pencil-necked twerp like you is going to give me orders, pal!
2. Very inclined toward academic or intellectual pursuits. I always made sure to make friends with the pencil-necked geeks in my math classes so they would help me out with the homework.
neck with (one)
old-fashioned slang To kiss and caress one passionately and for an extended period of time. The cars parked in "Lover's Lane" are filled with high school students necking with their boyfriends and girlfriends. If you hadn't been so busy necking with that guy, you might have realized we were all leaving the club!
See also: neck