1. Your cock returns to its original shape after being stretched or twisted in a particularly nasty fashion.

2. You pull too hard and your dick rips apart.
1.

Person 1: Okay, honey, you can open your eyes now.
Person 2: Jesus, love, what've you done to it?!
Person 1: Relax. Pop a Stretch Armstrong; you'll be fine.

2.

Person 1: Where's Gin?
Person 2: Emergency room.
Person 1: WTF?
Person 2: Yeah, he popped a Stretch Armstrong.
Person 1: Jesus.
Person 2: Yeah.
by Gel-filled action figure September 8, 2010
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