Good ole American fun...In fact...good ole fashioned fun from any region of the world.
The act of penetrating the mouth with the phallus.
Ex II: Wow he performs fellatio well
Ex III: HOLY SHIT!!! Is that cow performing fellatio?!?!? Oh never mind that's just Renee Zellweger
If fellatio is performed properly, one's partner will ejaculate, at which time you should swallow his generous deposit, though amateurs often expel the semen from their mouths.
Fellatio should be practiced frequently, for every art and skill should be honored and perfected.