Making an educated guess.
Extrapolating from previous experience and personal knowledge either to predict future events or explain events about which you have no direct knowledge.
"Why did she ignore me just now?"
"I'm just fishing off the bridge here, but I think it's because you didn't call her last time."
Man: Sometimes it's hard to resist the urge to drive right off a fucking bridge HHHhahaha oh look there's one
HUUUUhddJSUGYDSDKUHDHGUDBUJWYDYJLAKSJLKDLJSHIDHKNEKBDIFHLSNDBKS
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.