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Webster 1913 Edition

Verb.

[From

To move heavily; to lounge or idle; to loll.

[Low.]

Charles Reade.

lollop ‎(third-person singular simple present lollops, present participle lolloping, simple past and past participle lolloped)

To walk with a bouncing motion.
To loll or lounge
- 1861, All the Year Round: A Weekly Journal, Volume 5, Page 251
  Every available spyglass was directed towards strange sail. It appeared, as we all watched it, to lollop up and down, as it were, with the jerk of the sea, according to no regular motion of a ship or boat.