1 rounded tsp means you scoop a spoonful of sugar, and let it form a small pile above the top of the spoon. It is inherently less precise than a level teaspoon. 1 heaping tsp means you pretty much try to get as big a pile of sugar onto the spoon as you can, without spilling it.
He was the owner of The Park until the series finale, Benson's boss, the adoptive father of Pops, and husband of Mrs. Maellard. He has an office on the third story of the House where he is seldom seen. He made his first appearance in the Season 2 Episode "Dizzy".
Rigby has also died four times and was resurrected in the series. He was killed by Skips in an arm wrestling match, he was killed by Snowballs the Ice Monster, he was killed by Mordecai who pushed him into the Space-Time Continuum, and fell into a fatal coma in "Eggscellent".