| 1. | Jack in a box | ||
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When you have an erection that your girlfriend doesn't know about and you whip it out of your pants and show her your hard on, usually with a really pleased expression on your face. I was lying in bed reading the other day when Rob pulled down the sheets and sprung his jack in a box on me!
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| 2. | Jack in a Box | ||
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A penis that looks average until it is aroused and then erects to a size well above the norm. Andrew: Yes, my penis looks only about an inch long when it is soft.
Slampiece: Well I must admit, your Jack in a Box was a nice surprise! |
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