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1.
noun: physical intimacy wherein one or more participants contact the genitals of other participant(s), without specification as to whether any sort of penetration occurs. Having wowi is distinict from a "hook up," in that the latter connotes casualness or occurrence outside of a relationship. From the initial letters of "with or without intercourse."
Marcus and I just had some of the best wowi I'd ever had.
by atemperman April 20, 2003
 
2.
Oral sex

In Hispanic and latino culture it is slang for this
During intercourse my girlfriend gave me "wowis"
by un guey September 04, 2010