Green’s Dictionary of Slang

gant n.

[Scot. gant, a yawn, a gaping, but note cunt n. (1)]

a (large) vagina.

[UK]E. Phillips The mysteries of love & eloquence 110: She is loose and ungirt: / Want of wind makes her pant, / Till she fizzle and rant, / And the hole in her gant, / Is as deep as Levant.