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

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.