A woman who slashed her Tinder date with a kitchen knife after she found out he was already in a relationship has avoided spending time behind bars.

Alana Rose Jones, 26, was sentenced in the Brisbane District Court on Monday to 18 months' jail with immediate parole after pleading guilty to wounding and assault occasioning bodily harm.

Alana Rose Jones met a man she slashed with a knife on the Tinder dating app.

The court heard Jones spent the afternoon drinking at numerous venues with her date in February 2015 before he suggested they go back to her place.

Later that evening while the man was passed out, Jones intercepted text messages from his partner asking where he was.