it's like the merge of watchamacallit and awesome. Used when you can't put your finger on that word that you are looking for to describe something beyond superb.
When i went shopping today i saw the CUTEST pair of shoes, they were so freshtastic i just had to get them!!!
When a guy's freshness is beyond the normal boundaries of fresh and all of his friends are fresh too and his whole world is fresh. Freshness breathes out of his pores. An off the boat smell lingers wherever he goes. You can tell he is freshtastic by the way he walks and the fresh parting of his hair.
Any guy down whitechapel market will scream FRESHTASTIC!