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1.
a condom that is filled with a large amount of seamen that is sealed with a knot tied at the end.
I found a cum baby in between the couch cushions at the hotel i was staying.
by gravy robber September 27, 2009
 
2.
The effect of getting full on jizz; swallowing after so many blow jobs you look pregnant. Coined by the great Tweeter, msloulou
She's sucked so much cock it looks like she has a cum baby
by Eliza Dooks May 04, 2011