Top Definition
When you are not feeling well or hungover and sex would help.
She needs a shot of peniscillin.
by Amalia R October 24, 2006
The cure for the common "Can't have sex now honey, I have a headache!" excuse.
Boy: I'm on my way, hope you'll be dressed sexy and ready for me when I get home.

Girl: Oh honey, I can't have sex tonight. I have the worst headache. I must be coming down with something.

Boy: Don't worry baby, I'll give you the proper dose of Peniscillin which cures everything!
by LeslieSharp December 26, 2010
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