noun
plural messes
[count] :a very dirty or untidy state or condition - usually singular
[singular] :something or someone that looks very dirty or untidy
[count] a situation that is very complicated or difficult to deal with
something that is not organized well or working correctly
[singular] informal
someone who is very unhappy, confused, etc.
b US :someone who is showing a lot of emotion especially by crying
[count] :the place where people in the military eat
[singular] US informal :a large amount of something - + of
informal :solid waste from an animal [count]
make a mess of
to ruin (something) or to make many mistakes in doing (something)
verb
messes; messed; messing
mess around
or Brit mess about
[phrasal verb] informal
to spend time doing things that are not useful or serious :to waste time
to have sex with someone who is not your husband, wife, or regular partner
mess (someone) around/about Brit :to cause problems or trouble for (someone) especially by making changes that are not expected
mess around/about with (something)
to use or do (something) in a way that is not very serious
to handle or play with (something) in a careless or foolish way
mess up
[phrasal verb] informal
to make a mistake :to do something incorrectly
mess (something) up or mess up (something)
to make mistakes when you are doing or making (something)
to make (something) dirty or untidy :to make a mess of (something)
to damage or ruin (something)
mess (someone) up or mess up (someone)
a US :to beat and injure (someone)
to make (someone) very upset and unhappy
mess with
[phrasal verb] informal
mess with (someone) :to cause trouble for (someone) :to deal with (someone) in a way that may cause anger or violence
mess with (something)
a chiefly US :to deal with or be involved with (something that causes or that could cause trouble)
to handle or play with (something) in a careless way :to mess around with (something)
In very informal English, something that messes with your mind/head causes you to feel confused.