Top Definition
Used to casually slip into conversation the fact that someone in the conversation's zipper (or fly in UK) is undone, promting them to do it up.
Bob: "So I was like what the hell you can't talk to me like that and..."
Sam: "Wait, dude, your flying low!"
Bob: "Damn man!"
*sniggers from nearby people*
by "Youngie" January 15, 2009
To fly under the radar, or operate in a less than obvious way
I was flying low and managed to slip into work un-noticed
by HipsterSlang May 15, 2015

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