twerk · noun, verb1
Blend of twitch + jerk. The "sexually-provocative dance" sense was particularly popularized since c. 2000 by hip-hop from the United States of America, and again in 2013 by singer Miley Cyrus.
twerk · noun2
Blend of twerp + jerk, found primarily in the 1930s-era works of Walter Dumaux Edmonds.
twerk · noun3
Onomatopoeic, possibly coined by Roger Tory Peterson.
Etymology from Wiktionary, CC BY-SA 4.0.