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1.
When you are "friends" with someone you work with or go to school with but do not have contact with that person outside of the office/classroom.
Jim: Dude you're always talking with Ryan in class, do you guys hang out a lot after school?

Sean: Naw man, we're just part-time friends.
by MarvelousOnePak February 25, 2010
 
2.
A PTF is a person who desperately wishes to conduct a "Friendship Session" and will, unrelentingly, pester you until you do accept some terms. Then, after the session, they simply fade back into obscurity for weeks or months until they become bored again.
"Damnit, he's calling again!"
"What? That's the fifth time this hour!"
"Fuck it, i'll set up the damned Session so that I don't have to deal with this Part-Time Friend anymore."
"It doesn't last forever, you know. He'll bug you again in a week."
"*Sigh* I know..."
by MM3K September 29, 2012