> you're taking a piss
"You are taking a piss" -- you are currently urinating.
"You are taking the piss" -- you are mocking me or this.
> you're taking a piss
"You are taking a piss" -- you are currently urinating.
"You are taking the piss" -- you are mocking me or this.
Thank you. Sadly can't edit it anymore but I'll remember it next time.