Slang for breast implants, especially those that are obviously fake because they are too hard, too perfectly round, or too far part, etc., from their appearance of being bolted on to the patient’s body.

1. Sylvia’s really hot, but I don’t know about those bolt-ons. She looks like she’s shoplifting a couple of volleyballs.

2. Dan paid to get his wife a set of bolt-ons, and now she looks like she’s nursing inflatable twins.

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Breast Implants