protein injection 

Cum shot into an orafice

Bend over bitch, and get your protein injection

protein injection by lvp November 16, 2006

hot protein injection 

Male cum swallowed by a woman

I felt so bad for her she hadn't eaten in days so I let her suck my cock and I gave her a hot protein injection (HPI).

Oh man she was working my dick like nobodys business so I held back as long as I could till I gave her my hot protein injection.

hot protein injection by Larryboston November 27, 2011

Hot Protein Injection 

Male cum swallowed by a person

I felt so bad for her she hadn't eaten in days so I let her suck my cock and I gave her a hot protein injection (HPI).

Oh man she was working my dick like nobodys business so I held back as long as I could till I gave her my hot protein injection.

Hot Protein Injection by Looney Larry November 13, 2011

Protein Injector 

Male genitalia other wise known as the penis.

During the act of coitus, his girlfriend really didn't seem to appreciate being told to "milk his protein injector."

Protein Injector by thechurchfodave March 11, 2011