Blow my day (BMD) is akin to fuck my life in the sense that something just went wrong and it has ruined you're moment or day.
"That party should be pretty tight this weekend!"
"It's not happening. John's parents will be home."
"Fuck, blow my day!"
"It's not happening. John's parents will be home."
"Fuck, blow my day!"
by goodgirlgonebad December 23, 2009
Get the Blow My Daymug.