When two or more parties touch and rub their buttholes together. This is not only platonic, but extremely heterosexual as well.
Keithan: "I was cuddling in the bed of a Ford F150 with 36 of my closest homies, and we ended up all Siamese French-Kissing."

Daveth: "Dude, I wish I was that straight and platonic with my 36 closest homies."
by Iva Smallsach December 17, 2021
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