Hi TJ! You can absolutely use "cracked me up," but make sure it's included as part of a complete sentence (you'll need a subject). You can use it in many ways. Here are some examples:
1. You crack me up.
2. I crack myself up.
3. He/She/It cracks me up.
4. They crack me up.
5. We crack ourselves up.
6. They crack themselves up.
7. You cracked me up.
8. I cracked myself up.
9. He/She/It cracked me up.
10. They cracked me up.
11. We cracked ourselves up.
12. They cracked themselves up.
*You can keep changing the subject and direct object to create different combinations and have an even greater variety of sentences. (Ex: I crack you up; They crack us up, etc.)