Top Definition
The line between being friends and being lovers. If you become close friends first if one friend has feelings for the other and the other person just wants to keep it the way it was.

from the song Thin Line by Jurassic 5 featuring Nelly Furtado.
"please respect the thin line"
#friend with benefits #lovers #dating #confusion #awkward
by thecopsdaughter September 29, 2008
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