Chichis is slang for breasts, used playfully or casually in informal speech.
The word comes from Mexican Spanish and appears most often in Latino communities or contexts influenced by them: Nice chichis.
The term is mildly vulgar but not strongly offensive—more locker room than insult.
1. breasts — mammary, Of milk glands; bosom (Chest or heart area); bust (Failure or sculpture); chest (Ribcage region or strongbox); cleavage · nipples · areola · lactation · nursing · mammography · glandular · biopsy · augmentation · mastectomy
2. vulgar — lewd, Obscenely sexual; crass (Crudely lacking refinement); obscene (Grossly offensive to decency); crude (Unpolished, raw state); ribald · indecent · bawdy · raunchy · risque · off-color · blue · smutty · coarse · racy