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1.
1. The accumulation of milk, food, lint or other non distinct matter between the rolly polly fat layers of a baby's neck.

2. A meal that is so unidentifyable and mushy that it is comparable to a baby's neck jam.
1. Eww, I need a baby wipe to clean out Lily's baby neck jam.

2. Gee, mom, what did you cook? Baby neck jam? I'm ordering a pizza.

In music: "Oh hot damn baby neck jam, keep on wiping it fast as I can..."
by Kimmah May 12, 2010