A sexual act.
The beefee lays in the bath, almost completely submerged in hot
water.
The beefer (most commonly a male) stands over the bathtub, ejaculating onto the beefee.
The beefee is then surround by several cellular phones, all connected through a Skype call. This produces the radiation which will cook the ejaculant.
After two minutes in this position, the beefer sticks his index
finger into the bathtub
water, tastes, then proceeds to eat out the beefee (most commonly oral sex of the vagina or ass).
At a party...
Tom: 'Dude, can I borrow your phone so I can
beef this
chick?'
Chris: 'sure man, but make sure it's on the Wifi and not using all my
data.'
Tom: 'no worries, I'll ask Sam for the password first.'
Chris: 'Nice, enjoy your beefing.'