The poppy family, Papaveraceae, is also charactarized by two often fused sepals which often cover the developing flower and may fall off when it opens, and 4 petals. Some poppies, such as California Poppy (Eschscholzia californica may be charactarized by extremely soft petals as well.)
'Poppy' also can be taken to mean something which is associated with pop culture, or upbeatness and 'saccharine' sound. This is often heard relating to 'punk' music, as many of such punk/ska/rock bands such as less than jake or home grown are referred to as poppy punk. The prior bands are very good bands, however, as is referenced by New Found Glory, poppy music can also be insidiously annoying, uncreative, and just plain lousy