What is Like Crazy?
1.
A two word replacement for the adjective "crazily." It is typically used by younger individuals that do not yet know or care that it is improper grammar.
Dude, he is FAST! He ate that hamburger like crazy!
2.
1. the surprise of having a certain skill,
2. fast or very skillfully
We ran like crazy when the cops showed up, we could never do it again if we tried.
See