Made happy by a certain event or happening.
"I was talking to Todd and I just got SOOOOO happified!!!"
For when you think it's at the end of the school year but you're not sure when. From May fifteenth to April fifteenth. Therefore someone's birthday could be in Maypril, or they could put Maypril in their calender as a date.
Jimmy's birthday was in Maypril, but his mother always said it was May tenth, not Maypril twenty-fifth.