when you are fucking a guy or a girl up the ass, and then you pull out your shit covered dick, and write (in shit) 'S' on their back.
Once done, you then yell "You just got swanged" or "Swang Bitch"
guy: Dude, I totally swanged Scraz last night, but she yelled out 'Swang Bitch'
An alternate word for the phrase "butt-fucked." Usually used instead of the spoken phrase, to avoid parental interferrance in a conversation. Like other slang terms, it's highly versitle.