An old flame is a person that somebody has had an emotional, usually passionate, relationship with, who is still looked on fondly and with affection.
I saw my old flame the other day and she looked great.
מאת Gataki 24 בינואר, 2009
commonly used term for an ex lover, usually a female.
ah, shit. It's my old flame.
מאת Adrian 18 בפברואר, 2006