heap of (something)
1. A pile of something. Who left this heap of dirty laundry in the middle of the hallway?
2. A lot of something. You'll be in a heap of trouble if Mom finds out that you snuck out of the house last night.
(a) heap of (something)
a great deal of something. Tom's got a heap of money, but no one to spend it on. A teacher has to have a heap of patience as well as a lot of smarts.