To be in a state of "lert" is when your in the mood to basically fuck shit up.
When you are "lert" there is the constant feeling that nothing will satisfy you but a good time, seeking and pleasuring hot women or partaking in copious amounts of questionable activity frowned upon by most cultures (yes like masturbating in airplanes or doing lots of hard drugs).
the state of being in which your left breast has been ripped off and is flappping the wind due to being struck by the American Dream in the form of a convertible.