look up any word, like sparkle pony:
 
1.
Slang for 'suck my d***'. Used by students in school attempting to hide disrespect from teachers.
'Johnny, put your phone away!'
'Mister, summer day!'
by Mr Teacher Man April 14, 2010
 
2.
The state of being unaware of the day as a result of it being summer.
MOM- "get up do u know what day it is today?!?"
ME- "uhhh its summerday."
by nynick1 September 04, 2009