When two adults with kids get together bundling half and step brothers & sisters together with not a lot on common, so they have a baby to glue the family together. A glue baby.
#: What do you mean your brother and sister have the same mum and dad as you?
#: ahhh, one comes from each, I'm just the glue baby, I hold it all together.
During intense sexual intercourse, Elmer's school glue is squeezed into contact with the penis/vagina. This eventually slows the rapid thrusting and thus calms the mood.
I fucked this one girl, but with the rapid movement, my dick started to burn. I had to pull off a glue baby.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.