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Thanks to the song "on my line" by bay area rapper Taj-He-Spitz,this phrase became popular among many listeners.It is used when you can tell a good looking lady is physically attracted to you at a party or get together,therefore persuing sexual relations with her.
"She on my line bro"

or you can refer to the lyrics,"Is that yo girl,damn she fine,i aint gon' lie but she on my line,she on my line"
by Dj Taco March 02, 2010
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When someone is harassing you profusely without relent.
I gotta pay Roger back ASAP. He's been on my line tough for that $40 bucks he loaned me last week.
by Phreshside November 04, 2016
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