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1.
Fans of Lady Gaga say this as opposed to "Oh my God!"
Oh my Gaga! This ascot is fabulous!
by Chelicopter August 07, 2011
 
2.
An adjective to describe a sudden moment of shock, inspiring/recollecting thoughts of something Lady GaGa would do. Mainly used by Little Monsters in awkward moments.
Something spontaneous, surprising, new, shocking, GaGaliscious, OhmyGaGa
by pboylenyc April 10, 2011
 
3.
a fabulous version of OMG
Oh my Gaga!, did you see what he/she was wearing?! He/She looked fabulous!
by OMGaga February 21, 2011