Related to the practice of face fucking. After the man delivers his payload, he continues to thrust away.The woman tries to suggest he stop, resulting in a mute squeak and and bubbles of spunk issuing forth from her nose.
"Last time I chowed down on Lord Anthony Lones fat one, he made me bubble 'n' squeak, and completely ruined my make-up.'
When your fucking a girl (or masturbating, whichever one piques your fancy) and you get a phone call right before you cum, thereby disrupting your "flow".
(Cell phone rings).
Kevin: "Hello? Dude, I'm on the bubble!! I'll call you back in 5 minutes!"