Top Definition
Inward (at least partialy) curved nipples on one or both breasts. Can occur in both genders, but is much more common in men.
Dude, your kids are gonna need straws to breastfeed from your fnerps.
by imightbeagod666 January 08, 2009
7 Words related to fnerp
Nipple that is caved in to form a cone shaped indent.
Dan, your kids are gonna need freakin straws to get milk from your fnerps!
by MY NAME IS RYAN GODDAMNIT October 26, 2008

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