1. Slang term for a pair of breast implants that look unnatural, rock-hard and "bolted" onto their owner's chest much like the stiff, painful looking screws that were bolted on to the side of Frankenstein's neck in the classic horror film. This "bolted-on" look typically happens because of what is called capsular contraction. Capsular contraction is when scar tissue forms in the chest cavity and tightens around the implant(s), making the breast(s) hard and unnatural looking. The "bolted-on" look can also occur when extremely large breast implants are inserted into someone without enough fatty tissue in the breast area. "Bolt-ons" do not look natural. All bad boob jobs where it's obvious that the person has implants can be referred to as "bolt-ons".

2. A messed up boob job.

3. Cause for a malpractice suit.
"That chick's boob job doesn't look so good. It looks like she's got two rocks in her shirt."
"Yeah, those are a serious pair of bolt-ons."

by VeNaCE November 09, 2006
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After-market body parts. Fake boobs, titties, breasts. The faker the better. Bought them right off the rack at the store. Easy install: No cutting or welding required. JUST BOLT 'EM RIGHT ON!
Hey dude. Bolt-ons 12 o'clock.
Yeah man. She must have picked those up in the Oversize Parts dept at Boobs "R" Us.
by soulsurfer18 August 05, 2008
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She took a break from porn, then came back 10 years later with a harder body and a pair of bolt-ons.
by Willsofar October 13, 2010
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"Man I thought she had THE most bodacious rack, but when I copped a feel I realized they were bolt-ons."
by CJAMindigo May 30, 2010
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