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1. gobsmacked
being totally speachless.unable to think of anything to say.
i was gobsmacked when i won the lotto
2. gobsmacked
when you receive a text message off a friend ??? and after reading it you are left there with a gob that resembles a bottomless cave and eyes that can't even stop staring at the screen.
well fuck me dead, i was completely gobsmacked at the text message i received today.
3. Gobsmacked
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!
4. gobsmacked
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.