A Loofah (or any organic fiber scratchy scrubber)
The use of zacate is derived phonetically from the word "sacar" (to take out, to withdraw or pull out).
Most common uses include:
Zacatito p'al conejo: Take out the ganja dude.
No seas zacatón: Don't be a woosie
Sin zacate: To link several love acts without pulling out.