I love this song too but I have wondered for 8 years now what does "Surf's up" really means?
The lyrics in the refrain goes:
How hard
How hard
How hard do I gotta try
I want all of your love
Surf's up
I need it so bad
Surf's up
I need it so bad
Surf's up and so am I
I gotta give you some love
Surf's up
and so am I...
How are you if you are "Surf's up"? Any englishman/woman here who can be kind enough and explain it to a dum swede