For example:
take two compound words/phrases with a common start and end, and chain them together.
for example say i wanted to merge radioactive material, material world.
radioactive ________ world
the combination of all three words doesn't have to make sense, just like "radioactive material world" doesn't really make any sense. but nonetheless everyone guesses what word links the two given words together to make two different compounds.
once someone guesses it correctly they post their own puzzle.
sun____bed