A sexual act where a man with a large phallus inserts it into another mans less significant phallus. The term no-namer is given because it is too horrific for any known words to describe it.
Dude, Shane Diesel just did a no-namer to an asian man!
Chris: Where's Lannin today?
Daniel: He stayed home 'cause he's still sore from getting no-namered last night.
Chris: By who?