Here's the lyrics to [bad word] Maru Mori Mori by [bad word] and Tomoki (and sometimes Mook) so you can all sing along! 

 [bad word] maru mori mori minna [bad word] 
 [bad word] tsuru teka teka [bad word] [bad word] kana? 
 Wasuremon sunnayo (Mook talking) 
 Ookiku nattara osora ni koe ga todoku kana? 

 Itsu ma de demo issho dayo 

 [bad word] maru mori mori minna [bad word] 

 [bad word] tsuru teka teka [bad word] [bad word] kana? 

 Kanashikute naiteita hitori [bad word] kaerimichi 

 Konna toki honwaka na 

 Minna ni aitai na 

 [bad word] maru mori mori Omajinai dayo 

 [bad word] tsuru teka teka Nikkori egao 

 Ichi ni no san shi de goma shio-san 
1, 2, 3, 4 and goma-shio-san 
 Takusan dato oishii ne 

 [bad word] maru mori mori Puka puka ofuro 

 [bad word] tsuru pika pika Goshi goshi burashi 

 Mina-san gunnai mata [bad word] 

 Asagohan wa nandeshone? 

 Onaka [bad word] [bad word] yo (Mook talking) 

 Yoku [bad word] (Mook talking)