Term used to describe someone you once dated, who unlike you, cannot let go. So they "pop-up" randomly in places they know you frequent as such: Your favorite book store, the park where you go jogging, the mid-night movie at the theater near your house - even though they live at least an hour away.
An individual demonstrating Jack-in-the-box tendencies can quickly become a Stalker or a full blown Psychopath if not confronted with the Jack-in-the-box behavior.
Smitty and Jane break-up. Smitty, in a fit of anguish tells Jane he is leaving the country and never coming back.
Later that week....
Jane is jogging along her favorite running trail, rounds the bend and there Smitty is running toward her with a shit eating grin..."Oh Jane! I wasn't expecting to see you here!?!?" Smitty has pulled a classic Jack-in-the-Box.
a jack-in-the-box, is when, while havig intercourse, the mans penis, comes out of the other end o a womn, making her as suprised as a 2 year old with a jack-in-th-box
While one is having sexual intercourse with his girl and they are fucking but while his penis is in her he grabs the end of it and "shakes hands with mr. happy" until he climaxes.
Friend: "Hey man what did you dolast night, you look exhausted"
You: "Oh well man, Jack-In-The-Box came pretty "handy" last night near the "end" of my session with my wife."
When one takes Adderall when one is still half asleep, whilst setting one's alarm to go off ten minutes into the future. When the alarm goes off, one will find oneself jumping up, suddenly wide awake. Popping up out of one's bed like that fey, much-celebrated children's toy of yesteryear.