Bullin

n.

Heard in Laois, Armagh, Louth, Waterford, Sligo, Leitrim, Kerry, Wexford and Down

Said of a cow when she is in heat and ready for the bull. Also applied to a woman who is extremely eager for sexual activity.

In use

She's ina bullin'!

Posh English

Good gracious, that young lady is positively in heat.

Same phrase, other counties