Spanish slang. It literally mean "X" (as in the letter) but is used to describe something that is bland, uninteresting, dull.
¡Ayer fue muy equis!
Yesterday was very equis!
Libreng Koreo Araw- araw
Ang mga sulat are galing sa email@example.com. Kailanma'y hindi kami magpapadala ng spam sa inyo.