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1.
famous line from Tekken, used by Kazuya. The translation according to the subtitles is "so it's you"... Contrary to popular belief, does not mean "suck my cock". It may sound like it.
See: OMAIKA
another quotation from Kazuya

Kazuya: SAMAKA
Jin: WTF?
by TEKKENPEDIA April 22, 2010
 
2.
Used as an insult, the word derives from the phrase "Suck my cock", telling the person to give them oral sex. The word is usually used while having both hands infront of the groin (preferably with a wide space between them).
"Yo Keith! Samaka right now"
by dshay October 05, 2005