1) a word used for extremely loyal individuals. a person who would go to bat for their friends, lay down on train tracks for their friends, and is consistently supportive.
2) also can be used to describe action that is loyal in nature.
1) Thanks for being such a cheetah; you always make sure I'm okay.
She would never cross me, she's a cheetah through and through.
2) The fact that you researched all that information for me, that was so cheetah-like.