The easiest and quickest way to do this is to go to the level 'Bee-Having' and progress to any of the bee hives in the level that have solid ground (not ground that you can hide under).
From here you need to quickly slide and then spin the bee hive as soon as the first bee comes out of the hive. If done correctly this will give you an extra live, you can repeat this over and over as the bees respawn after about 5 seconds.
To get up to 99 lives should take around 7-10 mins depending on how many lives you currently have at the time.