Definition of Lurk

Verb: lurk lurk

Lie in wait, lie in ambush, behave in a sneaky and secretive manner
- skulk
Be about
"The high school students like to lurk in the Central Square";
- loiter, lounge, footle, lollygag [N. Amer], loaf, lallygag [N. Amer], hang around, mess about, tarry, linger, mill about, mill around, mooch [Brit]
Wait in hiding to attack
- ambush, scupper, bushwhack [N. Amer], waylay, ambuscade [archaic], lie in wait
(internet) view an internet forum without contributing anything