WorkingDay.groovy

class WorkingDay {

    def schedule = []

    WorkingDay() {
        def mc = new ExpandoMetaClass(WorkingDay, false, true)
        mc.initialize()
        this.metaClass = mc
    }

    def methodMissing(String name, args) {
        if (name.startsWith('work')) {
            schedule << "talk to girls"
        } else {
            schedule << "$name ${args[0]}"
        }
        this.metaClass."$name" = {argz -> schedule << "$name ${args[0]} again" }
    }

    def plan() {
        println "Today I am going to $schedule"
    }
}

def I = new WorkingDay()
I.eat 'breakfast'
I.take 'shower'
I.workOn 'XYZ-4350'
I.enjoy 'massage'
I.take 'shower'
I.go 'home'

I.plan()

Basic DSL on Groovy for demo