1. A short, chubby sausage
2. An erection that resembles such a sausage.
3. A short, thick penis attached to a German man.
Kara: Was it big?
Sara: Not bad...it was like a knackwurst.
Kara: Length matters to me.
Sara: Well I liked it.
by Kara&Sara December 10, 2007
Get the knackwurst mug.