verb. To brazenly and knowingly attend BYOB functions without contributing anything whatsoever. To drink from the common pool of alcoholic beverages greedily. One cannot be said to ruckzuck unless this happens repeatedly. You get a free pass once.
"Did you see that strumpet Lisa over there? Look at her... she's on her 4th martini. You know what she brought? Nothing, same as last time!"
"Yeah, she's ruckzucking again."