it’s an imaginaryperson a tweep use to send gifts from themselves-to-themselves for the purpose of chasing clout and making other tweeps shout “God When”
Usually a shortened version of anonymous for the idiots that can't spell, usually the people that use the worrd "anon" have the name anxn._.mxus or anon379103173820 (CODMW) but these ages of anon users range from as young as 8 to as old as 100, usually, again, they do shorten it to anon because Americans can't spell shit
"Ayo this anon bitch better stop using that damn 725"
or
"The anon purge is approaching us!"