What is Mouse In Your Pocket?
1.
Similar to "the royal we" but less condescending. Usually a retort when someone volunteers you to do something without asking you first.
"I have to move out of my apartment this weekend, can you guys help me?" Jake asked. "Sure thing, we'll be there first thing Saturday" Ryan said. "Whoa, what's this 'we' bullshit?" I replied, "you got a mouse in your pocket?"
See