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1.
to use part of a limited supply of a drug.
"Natalie, I know we were supposed to wait until the morning, but I think we should dip in to the coke right now."
by natarie July 31, 2007
 
2.
The act of barely inserting an unprotected penis inside a vagina in the heat of the moment, then quickly removing said penis to put on a condom before continuing with sexual intercourse.
Patty: Dude, did you fuck that chick last night?

Adam: Yeah man, I let myself dip in and got scared shitless, so pulled out right away and put on a glove to finish.
by jackstar25 March 16, 2013
 
3.
It's time to go. Usually used when your late for something or when you find your self in an unsatisfying or uncomfortable situation.
Q: What time is it?
A: 10 to 5.
- dipin

Q: What the fuck is that?
A: I think that's your mom getting a Cleveland Steamer
- dipin
by McLovin Life December 04, 2007