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1.
Translates to "last ones" in Portuguese.

- A poet who writes angsty and emo-sounding poetry

- Someone who has very little grip on reality as a whole.

- Uses too much internet time.

- Has massive mood swings.

If somewhone exhibits all these traits, they are most likely an Ultimos.
"Looks as if Ultimos did another poem today. I read it, and he needs some help."
by Mike Isard December 19, 2004
 
2.
a man, usually bald inserts his head into a ladies vagina
i got ultimoed last night
lips stinging a bit though
by pasa November 11, 2006