As an abbreviation mths
is months.
As a noun meths is
short form of methylated spirit.
mths
English
Abbreviation
(Abbreviation)
(head)
months
See also
* mth meths
English
Etymology 1
Shortened from (methylated spirit).
Noun
(-)
(chemistry) Short form of methylated spirit.
Etymology 2
From (meths) or (methylated spirits), as stereotypically drunk by tramps.
Noun
(head)
(Geordie)