Another question.

[kempermentor]

> > zanooda:
> > Thank you very much to everyone who replied, I really appreciate it :-). Somehow it never crossed my mind that part of this sentence may be omitted. This is probably the reason I couldn't understand it :-).
> <snip>
> > So what is catcalling, approval or disapproval :-)? How would you guys use this word?
 
> Geoff:
> With my usual hat on as a native UK English speaker, I would never 
> associate it with anything other than mockery or disapproval.....
> 
> Mark you, Fred and George seem to turn a lot of events into a joking 
> or mocking situation.

Kemper now:
I agree.  But I don't see F & G as joking/mocking their own... well at least not until they've been in the house.  

As it's Harry's perception of the event.  I think Harry perceives the catcalling (which I take to be whistling in this case) as enthusiasm for the House rather than anything disparaging or gross toward Lavender... though I can't imagine Harry 'using' that term if it were Dean, Neville, Ron, or Seamus that received the whistling (which, again, is what I read into the context.)

As I type, I'm thinking maybe JKR misused the word and meant whistling applause and not derision nor the 'whert whirl' sound usually associated with construction workers.

Kemper