When a female video game character in a game such as Overwatch or COD kills you and then proceeds to do a "tea bag" motion over your dead body. Basically a sign of disrespect just like regular tea bagging, just with a girl character.
Tracer killed me and repeatedly clam-slammed me.
DVA clam slammed me and I liked it
To interrupt or prevent female arousal or sexual activity. Equivalent to the term used amongst men (cock block)
Ashley and Jenny were hooking up when their friend Stephanie walked in unannounced and interrupted them. Ashley yelled, “Steph, don’t be such a clam slam & call next time before you come over!”