to slap someone after waving both of your arms in a 'flowy' motion as you would in a retro club. One arm movement must flow into the other and thn the slap should take place.
"john was winding me up so after school i grotto slapped him up on the field then ran of, im ghetto.
by Green_Day_All_Day January 21, 2006

7 Words Related to Grotto Slap

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