The 28-year-old signed a pre-contract with the Tangerines last month but Motherwell agreed a fee on Monday to allow the striker to move to Tayside now rather than in the summer.
Watt, the Premiership's top scorer this season, debuted from the bench against St Mirren on Tuesday but could not prevent the Tangerines from slumping to their sixth successive defeat.
But the former Celtic frontman is delighted to be at Tannadice and reckons those criticising his decision to leave Fir Park for a club three spots below are a misery he could do well without.
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