Crash car heart
Someone who falls in love quickly and easily and can develop deep emotions for someone else in a short time. These people usually end up getting rejected, but they don’t move on nearly as quickly as they fell in love. This word-phrase was most notability used by the legendary Fall Out Boy.
Johnny just got rejected by that girl today, he only knew her for a few weeks and already said he loved her, damn he sure is a crash car heart.