No room to swing a cat
Definition 1 of 1
Pro Tip 1/3Exaggeration
Expresses an extreme lack of space, often more than literal meaning. 
With all the boxes in here, there's no room to swing a cat!
Pro Tip 2/3Informal Usage
Used in casual conversation, not for formal writing or speech. 
I'd invite you over, but there's no room to swing a cat in my dorm room.
Pro Tip 3/3Humorous Tone
Often carries a light-hearted, humorous connotation, despite complaints about space. 
You'll love their kitchen; there's no room to swing a cat, but it's cozy.