We don't have synonyms for six-wheeler yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are sex, fix and mix.
(n) :
(military slang, by ellipsis of six o'clock) Rear, behind (rear side of something).
(n) :
Six o'clock.
(n) :
(card games) A playing card featuring six pips.
(n) :
(cricket) An event whereby a batsman hits a ball which does not bounce before passing over a boundary in the air, resulting in an award of 6 runs for the batting team.
(n) :
(military slang, by ellipsis of six o'clock) Rear, behind (rear side of something).
(n) :
Six o'clock.
(n) :
(card games) A playing card featuring six pips.
(n) :
(cricket) An event whereby a batsman hits a ball which does not bounce before passing over a boundary in the air, resulting in an award of 6 runs for the batting team.