1. In a familiar/joking context:
A friend or loved one who's chosen to employ an overtly non-subtle or border-line uncomfortable approach to drawing attention to something by a imposition of an appearance &/or behavior.

2. In a non-familiar context regarding a stranger:
An intrusively unapologetic & spatially-invasive creeper of the non-humorous or non-familiar variety or one who gives creeps.

3. A creepy animal, often nocturnal (e.g. Snakes, Possums); Can also be used lovingly to describe a cute, sneaky animal (e.g. Cats, Small furry pets).