What is the meaning of Metzitza?

a procedure performed in Rabbinic Judaism after the Jewish ritual of brit milah (covenent cut) following the two added steps of priya (uncovering) and circumcision (circle-cut) mandated by the Gelmud in 500 CE: in this 3rd extra step a mohel uses his mouth to suck blood from the penis of the male (usually a baby) he just uncovered and circumcised, drawing the blood from the wound where the prepuce (foreskin) was amputated.

Source: wiktionary.org