Higher highs & higher lows means that the market is in an uptrend. The bulls have taken over as the demand is higher than the supply so there is a lot of buying happening. Also the lows are higher because there is not much selling and every dip is an opportunity to enter.
Lower lows & lower highs is the reverse. The market is in a downtrend, the mode is bearish and the supply is higher than demand so there is heavy selling causing new lows. The highs are lower because there is not much buying and every rise is an opportunity to exit.