look up any word, like blumpkin:
 
2.
1. When someone is left speechless after witnessing or being told something incredible.

2. To be hit forceably in the mouth.
1. I was completely gob smacked when my girlfriend told me she was really a man!

Seeing that water skiing squirrel has left me gob smacked!

2. I got my gob smacked last night when I gave my woman a dirty sanchez.
by Petey Pie October 25, 2005
 
1.
being totally speachless.unable to think of anything to say.
i was gobsmacked when i won the lotto
by mike briggs July 13, 2003
 
3.
Adj.
Irish Slang
Speechless, stunned, surprised, in disbelief,
I was completely gob smacked when I found out she was up the pole. I couldn't believe it.
by Mike Eldred January 24, 2008
 
4.
Similar to a lemon party, this sexual act involved older and younger people, however it is an elderly lady with largely saggy boobs that is getting her 'gobs smacked' by a younger male.

Much like a kitten plays with a yarn of wool, batting it around in fascination, the young male smacks the old bat's boobs however he likes
It is also when an old lady wants to get a bit frisky and use her saggy boobs to smack a young male's gob or other parts of his body.
Male: Dude last night an old lady gobsmacked me, it was so good!

Old lady: Oh darling you wouldn't believe how well that 20 year old gobsmacked me last night, it was delightful!
by Bobetta Bobbington April 21, 2011
 
5.
To be kissed without having a say in the matter.
Did you hear Peter gobsmacked me last night? The only was he was ever going to get his lips on me.
by nvidic June 25, 2009