Top Definition
"Speak English, Motherfucker"
Acronym that should frequently and forcefully offered to immigrants--legal or illegal--to the US who refuse to assimilate and insist on jabbering in foreign tongue.
As I was getting on the 2 train in Wakefield, I passed a gaggle of babblers spewing forth "espanol." "S.E.M.F.!" I said. They thought it had something to do with green cards and the INS, and they scattered like cockroaches in the light.
作者 New York City Dave 2008年7月10日
2 more definitions
Shit Eating Mother Fucker
A little boy just stole your candy.
you yell, "Come back here you little semf!"
作者 alliSINFUL 2005年3月28日
Slant Eyed Mother Fucker.
I bet I could blind fold that SEMF with floss.
作者 BJCMTBOYLE 2005年10月07日

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