Creeper

Serpent is derived from the Latin word serpens which means to crawl or creep, and is synonymous with snake.

The type of locomotion often used by large (fat) snakes, such as pythons, is rectilinear. This is movement in a straight line where the belly scales are pulled forward and down to anchor the body, and then pulled back to move the snake forward over the ground. It is a caterpillar-like crawl. This is the slowest form of locomotion and enables them to be creepy.

Creeping is what snakes do best. Here is Jolene being a creep.

When I was handling Jolene she, without fail, slithered over to Alex. She usually wedges herself between him and the couch or tries to crawl behind him. Maybe she senses that he runs warm.
This time she managed to slip her way under his sweat shirt, slithered up his side, and into his sleeve. (In the second picture you can see the bulge which is her body wrapped around Alex's arm) She stayed there for a while, being a creep, and then found her way out. But then, being out of his shirt for only a minute, she shimmied up next to him and did it all over again.