Dribble means to let saliva run down from the mouth, as in drool, except for in sports where it means to handle the ball beautifully against an opponent.
"Dennis dribbled while he slept last night."
Drivel means to criticize someone for a stupid or pointless speech. Although it was formerly used in the same way as dribble, they have now been differentiated.
"His entire talking point was a drivel."