Where you hold your forskin closed, ejaculate into your forskin to create a piping bag of sorts, then proceed to decorate your partners breasts/face/wedding cake/gingerbread man etc with your semen.
Barry: that is some decorative calligraphy on that cake

Steve: yes i used my own polish piping bag
by JULIA GlLLARD December 15, 2019
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Firstly, you need to find a pregnant transgender sugar daddy. This can be done anywhere, but preferably Texas. You begin by taking them to a public pizza restaurant (the public bit is the fun part) and sitting down and ordering a large Texas BBQ pizza to share. You start feeding each other pizza and then inserting some into a piping bag that you brought with you. Put the piping bag aside while the trans sugar daddy encourages their boobs to lactate. They pull their top up and lactate into the piping bag. Then you resume feeding each other, but now using the piping bag with the breastmilk and pizza. After this many people will proceed to fuck whilst feeding each other with the piping bag, sometimes at home or sometimes at the public pizza place. This act is frowned upon largely and you need to be granted special permission by Caitlin Jenner in order to perform the act. The act must be completed in silence and the participants must not talk to each other during the process.
Oh boy Johnny, did you see that Texas bbq sugardaddy piping bag breastmilking in the pizza place the other day?!
by mothertruckerdude6969 June 3, 2018
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To lean over, compressing your abdomen, stimulating the realease of gas (either burp or fart).

Can possibly be done to someone else.
I dropped my pen under the desk at work and totally bag piped out a fart in front of all my coworkers.
by Stpaul83 February 26, 2018
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A term used by professional divers (see monkey fucking a football) to describe a particular person or organizations discombobulated attempt to complete a task. (Note the diver has air hoses and is underwater)
Holy shit! You’re so tangled in your own lines and hoses you look like an octopus fucking a bag pipe.
by Cubs4388 October 31, 2020
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I seen azza bag piping Chris last night. He was sucking his bum and squeezing his stomach
by October 27, 2021
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The man who wears the pants in a homosexual relationship. He “fills” his boyfriend’s, otherwise known as the “Twinkie” , cavities with his crème from his piping bag.
“Look at that gay couple over there”
“Who do you think is the piping bag in the relationship?”
by Sahaev August 4, 2023
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When a woman's natural breasts are so big that when she lays flat on her back they fall under her armpits.
I bet when she lays down she can play them bag pipes !
by SirEnglebertHumperdink March 19, 2017
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