spaghetti breakfast 

A euphemism for a specific style of hentai pornography that involves giant monsters with long wriggly masses of tentacles.

"That girl really enjoyed her spaghetti breakfast, which is rather unusual for the genre."

spaghetti breakfast by miscellaneous July 2, 2004

spaghetti breakfast 

A humorous slang term for the act of being raped by tentacles. See tentacle porn, hentai.

The etymology of the phrase comes from the idea of being force fed spaghetti, which resembles the tentacles, and the term breakfast which is sometimes used as a code word for sex. The breakfast thing really just indicates taking the noodles inside of yourself, normally in the case of eating, but in this case, not eating. People automatically realize that the phrase is not, in fact, referring to eating spaghetti for breakfast because of the unusual nature of such a meal.

Waiter: Our specials this morning include the Spaghetti Breakfast for 8.99.
Madam: My, I've never heard of that, what is it?
Waiter: Allow me to give you a free sample. BLURRRRGH! *sprouts tentacles*
Madam: AIEEEEEEEEEEEEEEEEEEE-- Ohh, yeah, deeper, to the left.

spaghetti breakfast by VidaLondres August 24, 2006

Breakfast Spaghetti 

When your noodle is still wet from the night before and she eats the left over sauce for breakfast

"Yo, I tore it up so good last night she came back for that breakfast spaghetti with some toast and a glass of OJ."

Breakfast Spaghetti by Borderhopper815 November 27, 2016