Steve Purcell's wedding toppers
screenshot of Sam & Max at the alter in the recap section of the first episode of the cartoon
Confirmation from Steve Purcell
While limited to Sam's imagination, this shows that Sam put thought into proposing to Max.
Valentines day drawing by Steve Purcell
Max referring to Sam as a first lady
Sam referring to Max as his 'petit copain'. Meaning 'boyfriend' in french.
An answer from the Reddit AMA on July 8, 2021