Lobotomy Popsicle (n.):
A euphemism for the male sexual member during the act of fellatio. This act is often accompanied by an impossibility to think, concentrate, reason, keep your toes from curling up, or (if it's a really good one and you are laying down on the bed), keep the sheets out of your ass crack.
Oh baby, I've had a lot on my mind lately. Why don't you spend some time sucking on the ol' lobotomy popsicle?