This is a term to define someone who is just goated and cracked at life. Or you're just a cool dude. If someone calls you SupDogger, consider yourself lucky.
a combination of sup and dude that sounds a lot like the word subdue and is meant to sort of subdue the perhaps heightened energy of another to get that person in a calmer and/or more humble state
person A: supdooo
person B: hey man hows it going? Idk why but I suddenly feel more chill for some reason – did you just cast a spell on me or something?