hmm... now where did you hear language like that? :) it's a bit rude and I doubt you'd find it in most dictionary... at least not the "oxford english dictionary" and if you did, there would be a note saying "slang"... it means to masturbate a guy with well most likely your hands... (can't believe i'm answering this...)

To jerk someone off is to give that special someone a handjob...

To "jerk around" (i.e., "stop jerking me around") is a colloquial term meaning to lead someone on to believing something which is not true, or to tease, or to falsely state, as in a lie. A "jerk" is a noun, which refers to someone who is rude, thoughtless, etc. To "jerk off" which is a noun phrase, refers to a male masturbating. However, a "jerkoff" could also refer to a person who you think is an idiot.

"Jerk" is another way of calling someone annoying. E.g. "You are such a jerk!" = "You are so annoying!" You can just use it to swear at someone like you would do with other words such as 'asshole', 'jackass', 'idiot' etc.

nathanksimpson, please combine all of your answers with "somebody"