Selling an item. When you have $0 out nobody can attack you and you come up as dtw (defender too weak). If you sell the cheapest item u get $973 back on hand. This way somebody can attack you and get the usual amt of money, while you only lose 973 per hit. Dropping pots is when you repeatedly sell items one by one as fast as u can...only one person can attack per item sold, that's why open osfs sometimes come up as dtw.
Damn it xD it's been a while since I've dropped pots bc i've been using the 20% troops method. So much easier