(1) Where you use yer legs to wrap around someone's waist in an affectionate cuddle; this is often done from behind, where you both are sitting on the floor. Extra points if you're barefoot at the time, since this not only eliminates the danger of your accidentally bruising your friend with hard shoe-soles, but it also allows him to tenderly fondle your toes in response to your loving gesture.
(2) Where you drape someone's legs over your shoulders and then wrap yer raised arms savoringly around his calves/thighs. This mutually-pleasurable action is often administered as a thank-you gesture to the person for his cuddling with you, letting you massage his feet/legs, etc.