When someone uses the pronoun "we," but no
one else actually wants to be included. Implies that the speaker must be referring to himself and the frog. Typically takes the form of the rhetorical question, "is there a frog in your
pocket?"
Alternatively may be a
mouse or other pocket-sized creature.
Billy said "we're going to clean up the apartment today," but it's all his mess. He must have a frog in his
pocket.
Boyfriend: I've decided that we're going to go
vegan.
Girlfriend: You got a frog in your pocket?