Definition of love up:
(v) :
(intransitive, informal) To demonstrate affection (on somebody).
(v) :
(transitive, informal) To demonstrate affection for; treat in a loving way.
(v) :
(transitive, informal) To accept; to love wholeheartedly.
(v) :
(transitive, informal) To make love to.
(v) :
(intransitive, slang) To be intoxicated on MDMA.