A dollop of concrete could mean anything from a bricklayer's trowelful to an entire truckload.

Capfka got it right, a dollop is a generous amount.. but not overflowing..
if you read the label of the immitation 'whipped cream' containers, they say a small contain has 56 servings.. (about 2 cups in volume, or about the same as i 1/2 pint of heavy cream whipped)in reality, for most house holds, it has 8 to 10 serving.

even in the commercials, they don't show it being doled out at a rate that would yeild 56 servings, they show it being served in dollops!

of course for whipped cream, one has schlag! (a german word-- don't know what it mean in german, but its come to mean a generous dollop of whip cream served with the food-- at least in people of a certain age--it could also signify sour cream, if appropriate.)

so one could say 'we had ice cream for dessert, not quite sundays, but it did have schlag and nuts."