Pants Rabbits (p 18) - Crabs.
Any species of invertebrates which have four or more legs and infest the pubic areas of humans, and are passed through sexual contact.
Sometimes inhabit beards and scalps.
1. You best not bang that whore, lest you get some nasty pants rabbits.
2. "What the hell kind of bed you giving us, anyways. We don't want no pants rabbits." Steinbeck, Jon. Of Mice and Men.
crabs crotch monsters vd std lice
*Definition from urbandictionary.com

Flop (p 53) - sexual intercourse
*Definition from http://www.gradesaver.com

Goo-Goo (p 53) - a derogatory term for a reformer, short for "good government" clubbers.
*Definition from http://www.gradesaver.com

**For more term definitions from Of Mice and Men that are not directly on the wiki go to http://www.gradesaver.com/of-mice-and-men/study-guide/glossary-of-terms/