The act of switching partners during anal sex without wiping the poop off your dick in between buttholes, effectively delivering feces from one anus to the other.
Chad: "Bruh that threesome with Angela and Britney last night was INSANE - Fucked 'em both in all holes and essentially gave Britney a fecal transplant, dawg.

Brad: "Fecal Transplant?? What the fuck are you talking abou-......Oh, dude, that is vile."

Chad: "100% - my shit was MUDDY when I switched over to Britney - but hey, fuck it, right?"

Brad: "You belong in a circle of Hell that has not yet been invented you depraved fuck."
by Gutters by the Dozen (1) January 20, 2020
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Fecal transplantation (or bacteriotherapy) is the transfer of stool from a healthy donor into the gastrointestinal tract for the purpose of treating recurrent C. difficile colitis.
Your doctor would say this to you if you needed this treatment.
Doctor: You need a Fecal Transplant.
Patient: Man, alright, i guess if the doctor says so.
by DragonSkittles September 18, 2018
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During anal sex, when a top fucks two different bottoms without cleaning off his dick in between
Jason gave me and Luke a fecal transplant with his cock last night”

“Dude, that’s hot
by shelby_18 May 6, 2020
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