what does this tammy thing refers to?
She's Ron's ex-wife.
Ron and Tammy
Ron (Nick Offerman) is particularly angry to learn his ex-wife Tammy (Megan Mullally), who he insists is evil incarnate, is the new library director.
who does tina fey play in parks and rec UNANSWERABLE
wiki:12353577
Ron and Tammy [SEP] Plot
Andy (Chris Pratt) takes over as the shoeshiner at the Pawnee town hall, replacing "Old Gus" (Jack Carter), who insults everybody during a farewell party. Later, Mark (Paul Schneider) breaks the bad news to Leslie (Amy Poehler) that the Pawnee library has placed a planning claim for Lot 48, which Leslie has been working to turn into a park. Leslie and the rest of the parks department express hatred for the library, which Leslie declares a "diabolical, ruthless bunch of bureaucrats", much to the confusion of Ann (Rashida Jones). Ron (Nick Offerman) is particularly angry to learn his ex-wife Tammy (Megan Mullally), who he insists is evil incarnate, is the new library director.