Hype or excitement towards up-and-coming Jeremy Lin of the New York Knicks. Often said after an outstanding athletic performance, usually in basketball.
Dave: Did you see the Knicks game last night? Jeremy Lin dropped 25 points!
Rick: Totally dude, it was Linsanity!
Rick: Totally dude, it was Linsanity!
by Haywood Jiblomy May 28, 2012

Linsanity is the insanity that Jeremy Lin offers to basketball! He puts the l on linspiring, the l in lintendo, and the l in linning. This guy became an overnight sensation!
Guy 1: You seen Jeremy Lin last night?
Guy 2: Fuckin' LINSANITY!
Guy 3: Yeah, he drives better than most Asians!
Guy 2: Fuckin' LINSANITY!
Guy 3: Yeah, he drives better than most Asians!
by BrandonUD April 24, 2012

Linsanity is a pun on Jeremy Lin's (NBA player) name that describes the excitement surrounding Jeremy Lin and his high scoring breakout performance with the new york knicks in February 2012.
by WACrown April 23, 2012

The cultural phenomenon created by the sensational play of previously unknown Knicks point guard, Jeremy Lin.
by chessarmenia April 24, 2012

The craziness that is sweeping the nation.
Refers to Jeremy Lin of the NY Knicks and the amazing man he is.
The Jeremy Lin.
To Linfinity and Beyond.
Refers to Jeremy Lin of the NY Knicks and the amazing man he is.
The Jeremy Lin.
To Linfinity and Beyond.
by Annabanana April 9, 2012

To perform a task at a mediocre level for a period of time and then suddenly excel beyond belief at that task.
by EmployeeNMBR12 April 17, 2012

The raging and sudden emergence of the Taiwanese-American basketball player Jeremy Lin, who broke the record for most points scored in a player's first 5 career starts and also the most turnovers. Harvard Grad that went undrafted in 2010 and was cut by 3 teams this season alone.
by Jbird April 9, 2012
