Haha'd is a similar phrase like Lol'd.
Basically you're laughing like "haha" but to tell people you've laughed you'd say "I just haha'd" or "haha'd".
Person A: Yo bro'! Ma bitch got pregnant!
Pereson B: Haha'd man! I just haha'd! I told ya to wear protection!
Example 2:
*Reads something on a forum"
- Haha'd! That's so funny! Hahahahaha'd!
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Haha'd means that you were laughed at because people thought you were foolish.
George thought he was going to give a great speech, but the audience only haha'd him out of the stadium.