Someone who has no life, plays Pokemon for 23 hours and crys for the remaining one hour.. On weekends he plays with little dolls and enjoys his time while playing dolls with his hotdog.
To have reached the point of inebriation, through consumption of the substance of choice, where the feeling is of the 'perfect high', no more, no less.
A "Quaddy" (short for Quadruple) refers to a legendary meal choice at McDonald's consisting of the normal Double Quarter Pounder meal that modifies it with the addition of two extra meat patties thus augmenting it into a Quaddy.