Andy holding it down for Taupou Tatau today!
Oxford living Dictionary states the definition of Mondayitis in English as:
Mondayitis
NOUN
informal, humorous
Reluctance to attend school or work, or a reduction in working efficiency, experienced on a Monday morning.
Origin
Early 20th century; earliest use found in Weekly Advocate (Victoria, Texas). From Monday + -itis.
Pronunciation
Mondayitis
/ˌmʌndiˈʌɪtɪs//ˌmʌndeɪˈʌɪtɪs/