It's a phrase used to express that something is happening or being done in the same way as it always has been.
For example:
* "Je suis heureux comme toujours." (I'm happy as always.)
* "Le café est délicieux, comme toujours." (The coffee is delicious, as always.)
It can also be used in a more figurative sense, meaning "the same as ever" or "nothing has changed".
For example:
* "Elle est toujours aussi belle." (She's still as beautiful.)
* "Il est toujours aussi têtu." (He's still as stubborn.)