pantylining 

When a male grazes his fingers across the bottom of a female's stomach, about where the elastic of her panty usually is, causing her to become extremely turned on; usually a precursor to being fingered and possibly sex.

Girl 1: Last night my boyfriend tried pantylining me.
Girl 2: How was it?
Girl 1: I've never been so turned on in my life!

pantylining by pensfan044 June 9, 2014

partylining 

When someone shares the same plane of movement with you in a paralell manner, usually very annoying. Happens mostly while driving, when one drives next to you, speeding up as you speed up and slowing down when you slow down, preventing you from changing lanes. Also happens while walking down the street, waiting in line, or jogging somewhere populated.

I was gonna get off at the last exit but that motherfucker in Tauras kept partylining me so I couldn't get over.

Hey I think that guy in the blue shorts has something for me. Everytime I get up to run a lap he keeps catching up and partylining me. It's really uncomfortable!

partylining by Stytches June 9, 2005