Hi Guyper, and welcome to English Forums. Guyper A. "Take a look at this picture and you'll know exactly what do I mean" no B.
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GuyperA. "Take a look at this picture and you'll know exactly what do I mean" no
B. "Take a look at this picture and you'll know exactly what I mean" yes
There is also another possibility: you'll know exactly what I do mean. This would be used emphatically. The person has misunderstood your meaning alr