Someone who is really, really annoying and has no filter. Needs to go somewhere else (like down a rabbit hole to visit the Cheshire cat) but nobody will tell them to get lost because they're actually really useful to mooch off of. My friend's boyfriend is a tool AND whipped.
Rose- "Ugh. Samuel Conrad Dahnerttttttttttttttt is such a tool."
Caroline- No! He's cute! BTW, can I have money for lunch?"
Rose- "I don't have any. Go ask your tool boyfriend for some. While you're at it, make him buy me an ice cream."