What is Hop In?
1.
The act of entering, usually, in some vehicle. Normally said with the goal of expressing a cool, stylish, and fast way of making your point, instead of "get inside of". May also be used with "into", instead of "in".
1"Nice car."
2"Hop in already."
1"I need to go home now."
2"Hop into the bike on the garage."
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Exclamatory ending to an uncontestable fact or comment resulting in the speechlessness of the opposing party.
Deriv.. 
1. 
The stroking of a matter vigorously back and forth in your cerebrum with great intensity until conclusion.
Materbation without conclusi..