Cries of surprise reach a climax after grand technical jargon (9)

'technical jargon' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'cries of surprise reach a climax after grand' is the wordplay.
'cries of surprise reach' becomes 'eeks' (I can't justify this - if you can you should give a lot more credence to this answer).
'a climax' becomes 'peak' (I've seen this in another clue).
'after' is a charade indicator (letters next to each other).
'grand' becomes 'g' (G is short for grand as in a thousand).
'eeks'+'peak'='eekspeak'
'eekspeak' put after 'g' is 'GEEKSPEAK'.

Can you help me to learn more?