mouth pipetting 

Performing oral sex, especially on a scientist or laboratory worker

The attractive female lab tech asked about the dangers of mouth pipetting and if she was at risk to accidentally inhale the DNA sample she wanted to collect

mouth pipetting by DrHyde November 5, 2010

Mississippi Pipeline 

The act of placing half of a straw up a man's urethra and the other half up another man's urethra. The pair can then proceed with fluid exchanges in the form of semen or urine.

Mike had just finished his fruity smoothie with Raph. The straw was tempting so they performed a Mississippi pipeline.

Mississippi Pipeline by ForMikeD June 18, 2011

Piper

A smart, Beautiful and pretty girl who any guy would be lucky to date.

I would gladly spend the rest of my life with a piper.

Piper by Biggy Bolt May 19, 2018

Piper

One who is a damn good lookin lady

Piper by Anonymous February 25, 2003

Golden Pipes 

(n.) A person's absolutely amazing singing voice that overtakes the listener with so much emotion that he has no choice but to cry uncontrollably or laugh hysterically.

Listen to Robert Plant's golden pipes! He can hit notes perfectly.

Golden Pipes by LuciferSam1967 September 10, 2010

stove piped your sister 

To have meaningful sex with ones sister.

i.e. Hey ziggy, I stove piped your sister last night and she loved it.

stove piped your sister by Stove piped your sister April 13, 2015

clean the pipes 

To jerk off, especially prior to a date, so you aren't thinking about sex all the time.

Make sure you clean the pipes before going out tonight, so you won't have the baby batter in the brain anymore.

clean the pipes by keyshaw September 11, 2004