a combination of smacking and grabing the ass of a unsuspecting victim all in one motion. It is an art form for SMRAB lovers or perfect for all future sex offenders:). There are many forms of SMRABing. Such as: Air SMRAB (where one jumps and is caught by a SMRAB of another), Trust SMRAB (a trust fall, but instead of catching him/her you catch em with a SMRAB), SMRAB with a running start,and a helicopter SMRAB (winding up your arm and SMRABing your victim). You could also make up your own.
Victim:"AHHH! Why did you SMRAB me you jerk?"
SMRABer: "mmmmm. I like that... Got a little fight in ya."