Codex Home → Developer Resources → Function Examples → bp_activity_action_spam_activity()
bp_activity_action_spam_activity()
bp_activity_action_spam_activity($activity_id=0) is a function that simply allows you to flag Budddypress Activity, like comments or activity updates as spam.
Source File
bp_activity_action_spam_activity() is located in bp-activity/bp-activity-actions.php