Scientific: this is displacement measured by the length of time light photons take to pass round yo mama's fat forehead.
Regular: that type of shit that make the girls dick drunk and lockjaw. It is commonly seen playing baseball with the moon but it can sometimes be seen in the constellations, a "heavenly body" of sorts.
Yolanda: OMG!!! LAST NIGHT'S PARTY WAS LIT! CAN YOU BELIEVE I GOT SOME OF DAT KEAGAN DICK
Rashanda: YOU TALKING ABOUT KEAGANS DICK?
Yolanda: HELLS YA SISTA!!
*proceeds to high five *
When a well endowed male is able to have sex in the doggystyle position and loosens up the female vaginally or anally he is able to insert most if not all of his penis into her orfice that he is penetrating
When wrapping a dollar around a penis to measure girth, a dollar dick is so thick that the ends of the dollar do not touch.
Allison: "Yo, do you know Victor?"
Erin: "Yeah, the guy you got with last night?"
Allison: "You know he has a dollar dick?"
Erin: "Must have been girthy"
Allison: "Yup, it was great. Less painful than I thought"