come all over your cock
Phrase used by many prostitutes/sex workers as an encouraging and motivating cheer to their current at-the-moment clientele in the hopes that the customer will hurry up and come so that their sex act can be finished and brought to a close.
Rolling her eyes as she wished she could be somewhere else besides where she was, Betsy got a hold on her urge to laugh, and with the most serious and ecstatic voice she could produce told David, "Ohhh yes, baby. I am fixing to come so hard I'm going to come all over your cock". Grinning big and proud of herself for not laughing, Betsy could hear David begin his vocalization of him coming inside her. 'Next' thought Betsy as she accidentally farted while David was still inside her.