Rare form of research within the Investment Banking Industry, used only by true masters in the art of Googling, who have gone to the end of the Internet and back in search for a bit of info to include in a document.
When presented with an extraordinary piece of info, a marveled reader might say: "This is magnificent! How in the world did you find this? You've been Fonsecling..!
Someone who is amazing, fun to talk to, a smooth talker, smart, sexy, attractive, has good hair, can be a player, flirts too much, and can make any girl fall for him. When he's drunk he's hysterical and wild.
"Fear Of Not Staying In" - Opposite mindset of FOMO, where you don't have the Fear Of Missing Out, but rather dread having to leave your place to do social things.
"I already confirmed "YES" to be there, but man, does that couch look really inviting. Call it a case of FONSI - I'm seriously conflicted."
Fonsed (verb). To continually annoy the 102. Panzergrenadier Battaillon's members without technically reaching the required number of warnings, but still being banned for it.
Random Pzgren.: Remember that guy who kept throwing a grenade at command every two weeks?
Random Gfr.: I heard he got Fonsed, he's not here anymore.