someone who constantly gives annoying advice, outdated opinions, or other very bothersome "help" with anything.
Store salesman: Hi, can I help find something in particular.
You: No thanks, we're just looking.
Store salesman: We have a 20% off sale on merchandise that nobody purchased last fall.
Your friend: Please don't badger us with your sales pitch.
store salesman: No problem, would you like to sign up for the club membership discount card and receive a marginal 10% discount off of already discounted items and junk mail at your home address. It's "free".
You: Let's get outta here; this guy is a Wisconsin badger.
Your friend: Later WB we're outta here.