Jewish by injection
(n.) a term used to describe a gentile, or non-Jew, who engages in intercourse with a Jew one or more times, thereby, becoming somewhat of an honorary Jew of sorts.
"Have you met my new girlfriend?"
"No. She's hot. Is she Jewish?"
"She is now, man. Jewish by injection!"
"Right on!"
"No. She's hot. Is she Jewish?"
"She is now, man. Jewish by injection!"
"Right on!"