Green’s Dictionary of Slang

pile v.

1. [late 19C] to cost, to amount to [SE pile up].

2. [late 19C+] usu. constr. with a prep., to move fast, e.g. pile off/on, pile in/out.

3. [1930s+] (US black/campus) to have sexual intercourse [one ‘makes a heap’].

4. [1970s] (US campus) to laze about [one ‘makes a heap’].

In phrases

pile in (v.) (also pile into, pile on(to))(orig. US)

1. [late 19C] to attack verbally.

2. [late 19C+] to attack physically, to crash into, to get to work on, to take part in.

pile up (at) (v.)

[late 19C+] (US) to end up (at), esp. of an evening out.

SE in slang uses

In phrases

pile it higher and deeper (v.) (also Ph.D., shovel it higher and deeper)

[1970s] (US) to boast, to lie.

pile it on (v.)

1. [mid-19C–1900s] to perform an act with greater intensity.

2. [late 19C+] to charge a high price.