When a man (or a woman with a strap-on) orgasms and with every thrust s/he screams one syllable for each ejaculation, usually in the missionary position for full impact on the recipient.
You shouldâve heard Joe sylla-cumming into Heather last night he was screaming âOh-My-God-I-Fah-King- Love-You-Aargh!â It was hilarious!