chupito
shot
chupar
to suck
+
-ito
diminutive suffix
Chupito means shot (of alcohol) and can be thought of as a small (-ito1) amount that you suck0 (chupar0) quickly.
noun
- shotA small glass of strong alcoholic drink, typically consumed in one gulpTomaron un chupito de tequila para celebrar. // They took a shot of tequila to celebrate.