Tightmare
Any pleasurable dream in which the dreamer experiences feelings of exhilaration, euphoria, pure bliss, etc.
Father: Last night, I dreamed that Justin Bieber was deported.
Misinformed Pre-teen Daughter: OMG daddy, that's a terrible nightmare!!!
Father: Nah bitch, that's a tightmare.
Misinformed Pre-teen Daughter: OMG daddy, that's a terrible nightmare!!!
Father: Nah bitch, that's a tightmare.