2006, Tim Downie, "Ride Report: Bealach-na-Ba", uk.rec.cycling http://groups.google.com/group/uk.rec.cycling/browse_thread/thread/af08b5a62b82262c/192dcd8f8dca7b8e?lnk=st&q=%22was+heaving%22&rnum=7#192dcd8f8dca7b8e
Kinlochewe was heaving with cyclists and their vehicles on Saturday morning but somehow, the organisers had found space for everyone and the main roads were kept clear.
2006, "Krusty", "Krusty's Holiday", uk.rec.motorcycles, http://groups.google.com/group/uk.rec.motorcycles/browse_thread/thread/f3c43a458f94a29b/bdff0eb3decbb853?lnk=st&q=%22was+heaving%22&rnum=99#
The pool was heaving with screaming kids. By contrast the beach was virtually deserted, apart from the one day a cruise ship docked & a group of about 10 people appeared.
2007, "Jamie", "Hyde Park Calling 2007", "classic rock magazine readers", http://groups.google.com/group/classic-rock-mag-readers/browse_thread/thread/7a5dc153e8401fb9/e32feaabd9dc9423?lnk=st&q=%22was+heaving%22&rnum=8#
At this time it was pissing down and by the time Joe Satriani came on the tent was heaving with people just coming in to keep dry.
noun
An occasion on which something heaves or is heaved.