When you are doing an Assignment or studying with a someone else but end up helping each other to procrastinate.
guy: "come help me study tonight yer?"
girl: "yer sure"
-six hours later-
girl: "funniest thing to show you on youtube, you can watch yours after!"
guy: "your nothing but a Procrastipartner"
A book, notes, or other study material that sits willingly and faithfully by your side the day before the exam while you procrastinate surfing the web or watching television.
Dude, I didn't get any studying done. Damn procrastipartner.