Rhubard

the verb: to Rhubard

To inconspicuously slink your way out of a group conversation by mumbling ("Rhubarb Rhubarb Rhubarb") in pursuit of attractive people you spot whilst in conversation with the group.
OR
To go awol in pursuit of sex, flirtation etc

Wait where did X go? I think he just rhubarded his way over to that waiter