Top definition
To engage in two or more unproductive activities at once.
"What are you doing?"

"Playing World of Warcraft, watching Judge Judy, and talking on the phone."

"When, quit multislacking and take our the garbage."
by Skewmaester July 05, 2009
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3
To be slack in several ways, against several people, more several reasons.
Public schools are so multislack.
by B-Drac July 26, 2003
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