To utterly amaze/astound someone, or alternatively convince them to make love to you.
Bob: Your mom's hot. Tonight, I'm going to charm their pants off.
Bill: Too much information, dad.
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When two people come together to watch Netflix, but then take their pants off.
Guy: You wanna come over and watch Netflix?
Girl: Sure, but only if we can Netflix and Pants Off
Guy: Okay
A person who's company you enjoy while also being able to engage in a healthy, non-committal sexual relationship
Adam is a confirmed bachelor. He has many friends. Many are Pants-On. However, from time to time he does have Pants-Off Friend.