This is the 12856th most frequent Russian word.
кучу
A lot; a pile; a heap.
Here, 'кучу' is used figuratively to mean 'a lot' or 'a heap'.
Я сделал кучу работы на этой неделе.
I did a heap of work this week.
In this instance, 'кучу' refers directly to a pile or a physical accumulation of items.
На столе лежала кучу бумаг.
There was a pile of papers on the table.
Here, 'кучу' again conveys the sense of 'a lot of,' relating to enjoyment or activities.