look up any word, like sparkle pony:
 
1.
spasmodic, not smooth said of a persons movements
His herky-jerky gait made me think he should not have been there.
by The Return of Light Joker September 20, 2009
 
2.
Motion sickness, or any other sickness, such as the flu, that induces nausea and vomiting.
Bob got the herky jerkies from riding in the back of the van.
by TransMayernik April 22, 2005