Stereotype used to categorize individuals who fall into a fairly modern trend in child rearing, where the child is not properly raised. Instead the parent(s) occupy the child by setting them in front of a TV as opposed to actively engaging the child in productive activities. This type of childhood typically fosters poor social behaviors and disorders such as ADHD, beckoning use of term.
A test tube baby was conceived by artificial means, by introducing the sperm and egg to each other outside the body. The zygote is then implanted into the future mother's womb.
Test tube babies are NOT born in test tubes. Not yet, anyway.
Jill had a very hard time getting pregnant, so she decided to try having a test tube baby.
Somebody who was conceived in a test tube using sub-standard materials and poor quality control resulting in retardedness and stupid behaviour in their adult life.
A : Dude C stuck his hand to his face using Super-Quick-Dry Glue.
B: Man, he's such a budget test tube baby.