A pale pink and grey typographic chocolate inspired piece of cockney rhyming slang on a greetings card.
'I should cocoa' (or coco) is cockney rhyming slang for 'I should say so' or 'I strongly agree' and is almost always used ironically or sarcastically, hence the addition of (indeed).
This card is blank inside, so it's up to you whether you go down the cockney rhyming or chocolate route....
Alternatively, you eat chocolate or drink some cocoa while you think about it.