The first phlegm of the morning, thick and semi-solid, usually green or brown in color. Must be expelled before having coffee.
Waking up after a long night, Jim coughed his protein donut into the sink before having his breakfast.
by Carrotman424 July 3, 2018
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Your lovers balloon knot after cream pieing it.

Variations - Glazed Protein Donut: Your lovers bunghole after leaving liquid children all over it.

Chocolate Protein Donut: A Protein Donut that hasn’t had an enema recently, thus leaking pulverized shit after.
“As soon as I came inside his rusty bullet hole, I couldn’t wait to eat his protein donut.”
by 8c’s September 28, 2021
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Eating your lover’s ass out, after cream pieing it.

Variation- Glazed protein donut: Eating your lover’s ass after cuming on, instead of in, their ballon knot.
“As soon as I came in him, I got down on all fours and ate his protein donut.”
by 8c’s September 28, 2021
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