being in a happy,jolly state of emotion. or just being a complete freak having bursts of fun at random moments
AT CHIPOTLE:
girl 1: i got to go to the bathroom. *skips of to bathroom singing lalala*
girl 2: uhhhhh....
girl 3: i think shes in lalaland.
*girl 2 and 3 go running after girl 1 to save her from further embarrasment*
Saying something really shitty, then fake laughing and saying "Just kidding, loooooooove you!". Originated with a player on the Fenrir server in the game Rappelz.
LalaLady just loves lala-ing people, but it's really annoying.