It's May Day, and the speaker of the poem is trying to get his girlfriend out of bed and into the outside festivities. It's a party outside, honey! He tries to shame her into hurrying up, describing how the morning is already in full bloom and all the villagers are eating cakes and courting like nobody's business. There's no time for primping or prayers when spring's a-coming in!
Besides, it's not like this kind of pleasure will just be around forever. They're in their prime right now—young, gorgeous, in love—and they should take advantage of the good weather to make love and play games. Seize the day, Corinna. 'Cause you'll be dead before you know it.