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1.
When a male fucks the hell out of a girl usually resulting in her crying, bleeding, screaming, hurting etc. Then afterwards her being obsessed and calling you and your friends trying to get ahold of you all damn day. Knowing damn well all she wants is some dick.
Go tell your mom to call me tonight because I probably gave her a deep dickin.
by Aaron December 19, 2003
 
2.
The act of inserting the penis fully into the vagina and using short thrusts while completely inserted. Female positions herself so that there are no obstructions to full insertion. Typically done in a scissor-like position.
I could use some deep dickin tonight.
by jmlbones September 23, 2009