Top Definition
Term; Used to describe a person, usually a female, as being likely to put on weight or get fat as she ages or when she gets older in age.

Term was developed as a metaphor relating to the energy 'expansion' that is created when a uranium atom is split which figuratively describes the 'expansion' of a woman's figure.
"That chick is so sexy, but she's going to split the atom when she gets older"
by JonDMA August 20, 2006
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