i call the mouth!
It's the cry of the man who wants to skip the fun and just get his cock sucked. He'll let the other guy do all the work and just sit there like a fat pig.
'I call the mouth!' he said, already eating a whole bag of chips.
'I call the mouth!' he yelled, not even trying to take off his pants.
'I call the mouth!' he said, already passed out on the bed.