A phrase, originally from the Hebrew and Arabic language.
The Hebrew Word Sababa is actually combined of two different words: Saba (Grandpa in English) and Ba (coms, comming and any other present tens of the verb "come").
After attaching those two words to one word you get Sababa whitch is used in the same way as OK, Cool, Neat and so on.
Some person: "Man I wanna go swimming. Do you wanna come?
You: "Grandpa comes (Sababa)"