Grundgetta is a Grouch character from Sesame Street and the girlfriend of Oscar the Grouch. Oscar occasionally calls her Grungie, while she generally calls him Oskie. In addition to being a "couple", they're best friends too. Oscar & Grundgetta, as stated by Oscar & Gordon's sister Olivia, have been friends for "a very long time".
Grundgetta, like Oscar, has had a number of pets over the years, including her worm Sylvia, a rottendoodle named Itchy & a muddy piglet who won the Yucchiest Pet contest in Oscar's Grouch Jamboree.
Grundgetta, like Oscar, sometimes slips up as a Grouch. In episode 3763 of Sesame Street, when she & Oscar tell Sally Messy Yuckyael how Oscar unwillingly fell in w/ her (which she snapped him out of completely by kissing him), Grundgetta starts to feel the same way. Like Grundgetta did, she hears "yucky sweet violin music", her heart starts going "pitty pat, pitty pat", & she no longer feels like arguing. She begs Oscar to kiss her before she confesses her love to him, which he does. However, just as expected she gets extremely angry. Oscar says she told him to do it, but then she asks him if he'd jump off a bridge if she told him to. After that they start arguing again.
Pam Arciero, in a video released on "Sesame Family Robinson", was playing around with the Grundgetta puppet. Grundgetta commented that she was nervous since she hadn't been on camera in months, referencing her absence in recent years.