Would someone explain what exactly that means?
Also is it right that there is comma between ‘hammer’ and ‘meet’?
Source: http://youtu.be/RidsxnnVTR4
Lyrics in print: http://www.lyricstime.com/dr-horrible-s-sing-along-blog-slipping-lyrics.html
Answer
I wouldn’t call this an established idiom, but it’s not uncommon to use two objects which strike each other, such as a hammer and a nail, to create a metaphor. One of the first examples that springs into my mind is from the song The Bug, which actually uses two such vehicles in its chorus:
Sometimes you’re the windshield
Sometimes you’re the bug
Sometimes it all comes together baby
Sometimes you’re just a fool in love
Sometimes you’re the Louisville Slugger
Sometimes you’re the ball
Sometimes it all comes together
Sometimes you’re gonna lose it all
One blogger alluded to that song lyric in a column about stress. It’s a catchy way to express the sentiment.
In short, I be very unlikely to insert the exact phrase "hammer, meet nail" into a conversation, even while talking about someone who was about to get a raw deal. But, particularly in the context of a musical, the phrase doesn’t strike me as being off in any way.
Attribution
Source : Link , Question Author : Bruno Gelb , Answer Author : J.R.
