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1.
Usually happens on an instant messenger. A person will quickly sign on, leave you a rude remark, and then sign off before you have the chance to respond. It'd be harder to do in a person to person conversation because you could easily kill them.
computer message SoAndSo123 has signed on
SoAndSo123: You're gay
computer message SoAndSo123 has signed off
Me: Damn I've just been in a drive by conversation!
by Cerpin Taxxt January 30, 2007

Words related to drive by conversation

computer message aim conversation drive by internet messenger
 
2.
When you are walking past two or more people having a conversation, and not knowing the context, often perceive it as inappropriate or funny.
(Man walks by)

Guy 1: Yeah she's really taking it hard.

Guy2: yeah it sounds like all that vibration is killing her bones.

Man 1: That's a drive-by conversation if I ever seen one.
by Caseyds620 January 24, 2011