Jerk

abécula

(unlikable person)

babaca

(dull or stupid person)

cacoete

(sudden, uncontrolled movement)

espasmo

(sudden, uncontrolled movement)

estúpido

(unlikable person)

puxada

(quick, often unpleasant tug or shake)

sacudida

(quick, often unpleasant tug or shake)

tique

(sudden, uncontrolled movement)

trejeito

(sudden, uncontrolled movement)

charquear

(to cure by cutting into strips and drying)

espasmar

(intransitive: to make a sudden uncontrolled movement)