This is a pseudo-medical procedure in which a male vertebrate from the phylum chordata inserts his phallus into a complimentary female's vagina.
Dude, I had to perform a slipendictomy on this girl today, she was alright.
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To stealthily insert one's member into one's partner's orifice, typically occurring in the morning.
I woke up with a raging boner and only 20 minutes to get ready for work. Foreplay would take too long and waking my partner would be bothersome. If I was to deswell my throbbing member, it was critical that I perform the slipendictomy quickly.