If you mean "with my friends":
* "Avec mes amis" (formal)
* "Avec mes potes" (informal)
* "Avec mes copains" (slightly less common, but still informal)
If you mean "with my buddies" (a slightly stronger sense of camaraderie):
* "Avec mes copains" (more commonly used for "buddies" than "amis")
* "Avec mes mecs" (very informal, mostly used by men)
Example sentences:
* "Je vais au cinéma avec mes amis." (I'm going to the cinema with my friends.)
* "On a passé la soirée avec nos potes." (We spent the evening with our mates.)
* "J'ai joué au foot avec mes copains." (I played football with my buddies.)
The best choice depends on the specific situation, your level of formality, and your relationship with the people you're talking about.