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1.
Term coined by celebrity blogger Perez Hilton, refering to epic failure Lindsay Lohan.

Similar to Perez Hilton's La Loca LOLhan
So the LAPD rushed over to Lindsanity LOLhan's Hollywood home Tuesday afternoon after being notified of a break-in at the wacktress' humble abode. The alarm went off.

Police officers found all sorts of evidence of a "potential break-in and ransacking" until the cops realized La Loca Lohan's home has always been a pigsty!
by SouthernKaytee May 27, 2009
 
2.
The nickname for actress and former(?) alcoholic/drug addict Lindsay Lohan. Originally coined by Perez Hilton, it refers to Ms. Lohan's crazy substance induced actions.
I felt like I was partying with Lindsanity last night, what with all that cocaine and alcohol you were putting into your body!
by vinobuzz July 20, 2010