Scratch back
A derogatory term referring to illegal alien from Latin America who, because s/he cannot swim, enters the U.S. by crawling under the fence, causing his/her back to get severely scratched.
Example:
Person 1 white trash: "Hey, Juan. Like, your Mom's a total wetback. They should deport y'all back to Mexico."
Person 2 (Hispanic respondent): "Actually, Billy Bob, you ignorant white trash racist pendejo, my Mom came from Guatemala and crawled under the fence carrying me. So, we're both scratch backs."
Person 1 white trash: "Hey, Juan. Like, your Mom's a total wetback. They should deport y'all back to Mexico."
Person 2 (Hispanic respondent): "Actually, Billy Bob, you ignorant white trash racist pendejo, my Mom came from Guatemala and crawled under the fence carrying me. So, we're both scratch backs."