Noun
(slang, idiomatic, humorous, childish) A person who is the latest, the last, or the slowest in a group at performing a certain task, especially at going to a certain place.
Last one there is a rotten egg!
(slang) A closeted transgender person who overcompensates by being actively transphobic.
Used other than figuratively or idiomatically: see rotten, egg.
Source: en.wiktionary.orgA rotten egg smell is sometimes caused by hydrogen sulphide gas, though this has not been confirmed here by the city. Source: Internet
Toxic algae that 'smells like rotten egg' is invading. Source: Internet